diff --git a/packages/frontend/src/components/MkCaptcha.vue b/packages/frontend/src/components/MkCaptcha.vue
index 2fa1135398..1c9de19c25 100644
--- a/packages/frontend/src/components/MkCaptcha.vue
+++ b/packages/frontend/src/components/MkCaptcha.vue
@@ -21,8 +21,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</div>
 		<div v-else>
 			<div style="font-size: 13px; margin-bottom: 4px;">Type "ai-chan-kawaii" to pass captcha</div>
-			<input v-model="testcaptchaInput" data-cy-testcaptcha-input/>
-			<button type="button" data-cy-testcaptcha-submit @click="testcaptchaSubmit">Submit</button>
+			<input v-model="testcaptchaInput" data-testid="testcaptcha-input"/>
+			<button type="button" data-testid="testcaptcha-submit" @click="testcaptchaSubmit">Submit</button>
 		</div>
 	</div>
 	<div v-else ref="captchaEl"></div>
diff --git a/packages/frontend/src/components/MkDialog.vue b/packages/frontend/src/components/MkDialog.vue
index fb8b38de6d..c5cb0f3b34 100644
--- a/packages/frontend/src/components/MkDialog.vue
+++ b/packages/frontend/src/components/MkDialog.vue
@@ -31,8 +31,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</MkInput>
 		<MkSelect v-if="select" v-model="selectedValue" :items="selectDef" autofocus></MkSelect>
 		<div v-if="(showOkButton || showCancelButton) && !actions" :class="$style.buttons">
-			<MkButton v-if="showOkButton" data-cy-modal-dialog-ok inline primary rounded :autofocus="!input && !select" :disabled="okButtonDisabledReason != null" @click="ok">{{ okText ?? ((showCancelButton || input || select) ? i18n.ts.ok : i18n.ts.gotIt) }}</MkButton>
-			<MkButton v-if="showCancelButton || input || select" data-cy-modal-dialog-cancel inline rounded @click="cancel">{{ cancelText ?? i18n.ts.cancel }}</MkButton>
+			<MkButton v-if="showOkButton" data-testid="modal-dialog-ok" inline primary rounded :autofocus="!input && !select" :disabled="okButtonDisabledReason != null" @click="ok">{{ okText ?? ((showCancelButton || input || select) ? i18n.ts.ok : i18n.ts.gotIt) }}</MkButton>
+			<MkButton v-if="showCancelButton || input || select" data-testid="modal-dialog-cancel" inline rounded @click="cancel">{{ cancelText ?? i18n.ts.cancel }}</MkButton>
 		</div>
 		<div v-if="actions" :class="$style.buttons">
 			<MkButton v-for="action in actions" :key="action.text" inline rounded :primary="action.primary" :danger="action.danger" @click="() => { action.callback(); modal?.close(); }">{{ action.text }}</MkButton>
diff --git a/packages/frontend/src/components/MkFolder.vue b/packages/frontend/src/components/MkFolder.vue
index 1def3de97a..f4dd9f526d 100644
--- a/packages/frontend/src/components/MkFolder.vue
+++ b/packages/frontend/src/components/MkFolder.vue
@@ -7,7 +7,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <div ref="rootEl" :class="$style.root" role="group" :aria-expanded="opened">
 	<MkStickyContainer>
 		<template #header>
-			<button :class="[$style.header, { [$style.opened]: opened }]" class="_button" role="button" data-cy-folder-header @click="toggle">
+			<button :class="[$style.header, { [$style.opened]: opened }]" class="_button" role="button" data-testid="folder-header" @click="toggle">
 				<div :class="$style.headerIcon"><slot name="icon"></slot></div>
 				<div :class="$style.headerText">
 					<div :class="$style.headerTextMain">
diff --git a/packages/frontend/src/components/MkModal.vue b/packages/frontend/src/components/MkModal.vue
index 92174d8ef7..d397531680 100644
--- a/packages/frontend/src/components/MkModal.vue
+++ b/packages/frontend/src/components/MkModal.vue
@@ -33,7 +33,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	:duration="transitionDuration" appear @afterLeave="onClosed" @enter="emit('opening')" @afterEnter="onOpened"
 >
 	<div v-show="manualShowing != null ? manualShowing : showing" ref="modalRootEl" v-hotkey.global="keymap" :class="[$style.root, { [$style.drawer]: type === 'drawer', [$style.dialog]: type === 'dialog', [$style.popup]: type === 'popup' }]" :style="{ zIndex, pointerEvents: (manualShowing != null ? manualShowing : showing) ? 'auto' : 'none', '--transformOrigin': transformOrigin }">
-		<div data-cy-bg :data-cy-transparent="isEnableBgTransparent" class="_modalBg" :class="[$style.bg, { [$style.bgTransparent]: isEnableBgTransparent }]" :style="{ zIndex }" @click="onBgClick" @mousedown="onBgClick" @contextmenu.prevent.stop="() => {}"></div>
+		<div data-testid="bg" :data-test-is-transparent="isEnableBgTransparent" class="_modalBg" :class="[$style.bg, { [$style.bgTransparent]: isEnableBgTransparent }]" :style="{ zIndex }" @click="onBgClick" @mousedown="onBgClick" @contextmenu.prevent.stop="() => {}"></div>
 		<div ref="content" :class="[$style.content, { [$style.fixed]: fixed }]" :style="{ zIndex }" @click.self="onBgClick">
 			<slot :max-height="maxHeight" :type="type"></slot>
 		</div>
diff --git a/packages/frontend/src/components/MkModalWindow.vue b/packages/frontend/src/components/MkModalWindow.vue
index b8d9da0a13..bb1e63862e 100644
--- a/packages/frontend/src/components/MkModalWindow.vue
+++ b/packages/frontend/src/components/MkModalWindow.vue
@@ -7,7 +7,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <MkModal ref="modal" v-slot="{ type }" :preferType="deviceKind === 'smartphone' ? 'drawer' : 'dialog'" @click="onBgClick" @closed="emit('closed')" @esc="emit('esc')">
 	<div ref="rootEl" :class="[$style.root, type === 'drawer' ? $style.asDrawer : null]" :style="{ width: type === 'drawer' ? '' : `${width}px`, height: type === 'drawer' ? '' : `min(${height}px, 100%)` }">
 		<div :class="$style.header">
-			<button v-if="withCloseButton" :class="$style.headerButton" class="_button" data-cy-modal-window-close @click="emit('close')"><i class="ti ti-x"></i></button>
+			<button v-if="withCloseButton" :class="$style.headerButton" class="_button" data-testid="modal-window-close" @click="emit('close')"><i class="ti ti-x"></i></button>
 			<span :class="$style.title">
 				<slot name="header"></slot>
 			</span>
diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index a1f2a7b138..8cdaf5b1da 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -37,7 +37,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<span v-else><i class="ti ti-rocket-off"></i></span>
 			</button>
 			<button ref="otherSettingsButton" v-tooltip="i18n.ts.other" class="_button" :class="$style.headerRightItem" @click="showOtherSettings"><i class="ti ti-dots"></i></button>
-			<button ref="submitButtonEl" v-click-anime class="_button" :class="$style.submit" :disabled="!canPost" data-cy-open-post-form-submit @click="post">
+			<button ref="submitButtonEl" v-click-anime class="_button" :class="$style.submit" :disabled="!canPost" data-testid="post-form-submit" @click="post">
 				<div :class="$style.submitInner">
 					<template v-if="posted"></template>
 					<template v-else-if="posting"><MkEllipsis/></template>
@@ -77,7 +77,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	</div>
 	<div :class="[$style.textOuter, { [$style.withCw]: useCw }]">
 		<div v-if="targetChannel" :class="$style.colorBar" :style="{ background: targetChannel.color }"></div>
-		<textarea ref="textareaEl" v-model="text" :class="[$style.text]" :disabled="posting || posted" :readonly="textAreaReadOnly" :placeholder="placeholder" data-cy-post-form-text @keydown="onKeydown" @keyup="onKeyup" @paste="onPaste" @compositionupdate="onCompositionUpdate" @compositionend="onCompositionEnd"></textarea>
+		<textarea ref="textareaEl" v-model="text" :class="[$style.text]" :disabled="posting || posted" :readonly="textAreaReadOnly" :placeholder="placeholder" data-testid="post-form-text" @keydown="onKeydown" @keyup="onKeyup" @paste="onPaste" @compositionupdate="onCompositionUpdate" @compositionend="onCompositionEnd"></textarea>
 		<div v-if="maxTextLength - textLength < 100" :class="['_acrylic', $style.textCount, { [$style.textOver]: textLength > maxTextLength }]">{{ maxTextLength - textLength }}</div>
 	</div>
 	<input v-show="withHashtags" ref="hashtagsInputEl" v-model="hashtags" :class="$style.hashtags" :placeholder="i18n.ts.hashtags" list="hashtags">
diff --git a/packages/frontend/src/components/MkServerSetupWizard.vue b/packages/frontend/src/components/MkServerSetupWizard.vue
index 462ded6de3..2e7eca5553 100644
--- a/packages/frontend/src/components/MkServerSetupWizard.vue
+++ b/packages/frontend/src/components/MkServerSetupWizard.vue
@@ -5,7 +5,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <template>
 <div class="_gaps_m">
-	<MkInput v-model="q_name" data-cy-server-name>
+	<MkInput v-model="q_name" data-testid="server-setup-server-name">
 		<template #label>{{ i18n.ts.instanceName }}</template>
 	</MkInput>
 
@@ -186,7 +186,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</div>
 
 		<template #footer>
-			<MkButton gradate large rounded data-cy-server-setup-wizard-apply style="margin: 0 auto;" @click="applySettings">
+			<MkButton gradate large rounded data-testid="server-setup-wizard-apply" style="margin: 0 auto;" @click="applySettings">
 				<i class="ti ti-check"></i> {{ i18n.ts._serverSetupWizard.applyTheseSettings }}
 			</MkButton>
 		</template>
diff --git a/packages/frontend/src/components/MkSignin.input.vue b/packages/frontend/src/components/MkSignin.input.vue
index 89ec6373cf..fcca205a2b 100644
--- a/packages/frontend/src/components/MkSignin.input.vue
+++ b/packages/frontend/src/components/MkSignin.input.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div :class="$style.wrapper" data-cy-signin-page-input>
+<div :class="$style.wrapper" data-testid="signin-page-input">
 	<div :class="$style.root">
 		<div :class="$style.avatar">
 			<i class="ti ti-user"></i>
@@ -32,11 +32,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 		<!-- username入力 -->
 		<form class="_gaps_s" @submit.prevent="emit('usernameSubmitted', username)">
-			<MkInput v-model="username" :placeholder="i18n.ts.username" type="text" pattern="^[a-zA-Z0-9_]+$" :spellcheck="false" autocomplete="username webauthn" autofocus required data-cy-signin-username>
+			<MkInput v-model="username" :placeholder="i18n.ts.username" type="text" pattern="^[a-zA-Z0-9_]+$" :spellcheck="false" autocomplete="username webauthn" autofocus required data-testid="signin-username">
 				<template #prefix>@</template>
 				<template #suffix>@{{ host }}</template>
 			</MkInput>
-			<MkButton type="submit" large primary rounded style="margin: 0 auto;" data-cy-signin-page-input-continue>{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
+			<MkButton type="submit" large primary rounded style="margin: 0 auto;" data-testid="signin-page-input-continue">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
 		</form>
 
 		<!-- パスワードレスログイン -->
diff --git a/packages/frontend/src/components/MkSignin.password.vue b/packages/frontend/src/components/MkSignin.password.vue
index 3b3b6a0b73..5fdb811d0c 100644
--- a/packages/frontend/src/components/MkSignin.password.vue
+++ b/packages/frontend/src/components/MkSignin.password.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div :class="$style.wrapper" data-cy-signin-page-password>
+<div :class="$style.wrapper" data-testid="signin-page-password">
 	<div class="_gaps" :class="$style.root">
 		<div :class="$style.avatar" :style="{ backgroundImage: user ? `url('${user.avatarUrl}')` : undefined }"></div>
 		<div :class="$style.welcomeBackMessage">
@@ -18,7 +18,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<!-- ブラウザ オートコンプリート用 -->
 			<input type="hidden" name="username" autocomplete="username" :value="user.username">
 
-			<MkInput v-model="password" :placeholder="i18n.ts.password" type="password" autocomplete="current-password webauthn" :withPasswordToggle="true" required autofocus data-cy-signin-password>
+			<MkInput v-model="password" :placeholder="i18n.ts.password" type="password" autocomplete="current-password webauthn" :withPasswordToggle="true" required autofocus data-testid="signin-password">
 				<template #prefix><i class="ti ti-lock"></i></template>
 				<template #caption><button class="_textButton" type="button" @click="resetPassword">{{ i18n.ts.forgotPassword }}</button></template>
 			</MkInput>
@@ -31,7 +31,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<MkCaptcha v-if="instance.enableTestcaptcha" ref="testcaptcha" v-model="testcaptchaResponse" provider="testcaptcha" :sitekey="null"/>
 			</div>
 
-			<MkButton type="submit" :disabled="needCaptcha && captchaFailed" large primary rounded style="margin: 0 auto;" data-cy-signin-page-password-continue>{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
+			<MkButton type="submit" :disabled="needCaptcha && captchaFailed" large primary rounded style="margin: 0 auto;" data-testid="signin-page-password-continue">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
 		</form>
 	</div>
 </div>
diff --git a/packages/frontend/src/components/MkSignupDialog.form.vue b/packages/frontend/src/components/MkSignupDialog.form.vue
index 68ba09980a..4de8bcc6ac 100644
--- a/packages/frontend/src/components/MkSignupDialog.form.vue
+++ b/packages/frontend/src/components/MkSignupDialog.form.vue
@@ -10,11 +10,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 	</div>
 	<div class="_spacer" style="--MI_SPACER-min: 20px; --MI_SPACER-max: 32px;">
 		<form class="_gaps_m" autocomplete="new-password" @submit.prevent="onSubmit">
-			<MkInput v-if="instance.disableRegistration" v-model="invitationCode" type="text" :spellcheck="false" required data-cy-signup-invitation-code>
+			<MkInput v-if="instance.disableRegistration" v-model="invitationCode" type="text" :spellcheck="false" required data-testid="signup-invitation-code">
 				<template #label>{{ i18n.ts.invitationCode }}</template>
 				<template #prefix><i class="ti ti-key"></i></template>
 			</MkInput>
-			<MkInput v-model="username" type="text" pattern="^[a-zA-Z0-9_]{1,20}$" :spellcheck="false" autocomplete="username" required data-cy-signup-username @update:modelValue="onChangeUsername">
+			<MkInput v-model="username" type="text" pattern="^[a-zA-Z0-9_]{1,20}$" :spellcheck="false" autocomplete="username" required data-testid="signup-username" @update:modelValue="onChangeUsername">
 				<template #label>{{ i18n.ts.username }} <div v-tooltip:dialog="i18n.ts.usernameInfo" class="_button _help"><i class="ti ti-help-circle"></i></div></template>
 				<template #prefix>@</template>
 				<template #suffix>@{{ host }}</template>
@@ -29,7 +29,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<span v-else-if="usernameState === 'max-range'" style="color: var(--MI_THEME-error)"><i class="ti ti-alert-triangle ti-fw"></i> {{ i18n.ts.tooLong }}</span>
 				</template>
 			</MkInput>
-			<MkInput v-if="instance.emailRequiredForSignup" v-model="email" :debounce="true" type="email" :spellcheck="false" required data-cy-signup-email @update:modelValue="onChangeEmail">
+			<MkInput v-if="instance.emailRequiredForSignup" v-model="email" :debounce="true" type="email" :spellcheck="false" required data-testid="signup-email" @update:modelValue="onChangeEmail">
 				<template #label>{{ i18n.ts.emailAddress }} <div v-tooltip:dialog="i18n.ts._signup.emailAddressInfo" class="_button _help"><i class="ti ti-help-circle"></i></div></template>
 				<template #prefix><i class="ti ti-mail"></i></template>
 				<template #caption>
@@ -45,7 +45,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<span v-else-if="emailState === 'error'" style="color: var(--MI_THEME-error)"><i class="ti ti-alert-triangle ti-fw"></i> {{ i18n.ts.error }}</span>
 				</template>
 			</MkInput>
-			<MkInput v-model="password" type="password" autocomplete="new-password" required data-cy-signup-password @update:modelValue="onChangePassword">
+			<MkInput v-model="password" type="password" autocomplete="new-password" required data-testid="signup-password" @update:modelValue="onChangePassword">
 				<template #label>{{ i18n.ts.password }}</template>
 				<template #prefix><i class="ti ti-lock"></i></template>
 				<template #caption>
@@ -54,7 +54,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<span v-if="passwordStrength == 'high'" style="color: var(--MI_THEME-success)"><i class="ti ti-check ti-fw"></i> {{ i18n.ts.strongPassword }}</span>
 				</template>
 			</MkInput>
-			<MkInput v-model="retypedPassword" type="password" autocomplete="new-password" required data-cy-signup-password-retype @update:modelValue="onChangePasswordRetype">
+			<MkInput v-model="retypedPassword" type="password" autocomplete="new-password" required data-testid="signup-password-retype" @update:modelValue="onChangePasswordRetype">
 				<template #label>{{ i18n.ts.password }} ({{ i18n.ts.retype }})</template>
 				<template #prefix><i class="ti ti-lock"></i></template>
 				<template #caption>
@@ -67,7 +67,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<MkCaptcha v-if="instance.enableRecaptcha" ref="recaptcha" v-model="reCaptchaResponse" :class="$style.captcha" provider="recaptcha" :sitekey="instance.recaptchaSiteKey"/>
 			<MkCaptcha v-if="instance.enableTurnstile" ref="turnstile" v-model="turnstileResponse" :class="$style.captcha" provider="turnstile" :sitekey="instance.turnstileSiteKey"/>
 			<MkCaptcha v-if="instance.enableTestcaptcha" ref="testcaptcha" v-model="testcaptchaResponse" :class="$style.captcha" provider="testcaptcha" :sitekey="null"/>
-			<MkButton type="submit" :disabled="shouldDisableSubmitting" large gradate rounded data-cy-signup-submit style="margin: 0 auto;">
+			<MkButton type="submit" :disabled="shouldDisableSubmitting" large gradate rounded data-testid="signup-submit" style="margin: 0 auto;">
 				<template v-if="submitting">
 					<MkLoading :em="true" :colored="false"/>
 				</template>
diff --git a/packages/frontend/src/components/MkSignupDialog.rules.vue b/packages/frontend/src/components/MkSignupDialog.rules.vue
index 0ba3ac3615..e246a54460 100644
--- a/packages/frontend/src/components/MkSignupDialog.rules.vue
+++ b/packages/frontend/src/components/MkSignupDialog.rules.vue
@@ -49,14 +49,14 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 				<a href="https://misskey-hub.net/docs/for-users/onboarding/warning/" class="_link" target="_blank">{{ i18n.ts.basicNotesBeforeCreateAccount }} <i class="ti ti-external-link"></i></a>
 
-				<MkSwitch :modelValue="agreeNote" style="margin-top: 16px;" data-cy-signup-rules-notes-agree @update:modelValue="updateAgreeNote">{{ i18n.ts.agree }}</MkSwitch>
+				<MkSwitch :modelValue="agreeNote" style="margin-top: 16px;" data-testid="signup-rules-notes-agree" @update:modelValue="updateAgreeNote">{{ i18n.ts.agree }}</MkSwitch>
 			</MkFolder>
 
 			<div v-if="!agreed" style="text-align: center;">{{ i18n.ts.pleaseAgreeAllToContinue }}</div>
 
 			<div class="_buttonsCenter">
 				<MkButton inline rounded @click="emit('cancel')">{{ i18n.ts.cancel }}</MkButton>
-				<MkButton inline primary rounded gradate :disabled="!agreed" data-cy-signup-rules-continue @click="emit('done')">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
+				<MkButton inline primary rounded gradate :disabled="!agreed" data-testid="signup-rules-continue" @click="emit('done')">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
 			</div>
 		</div>
 	</div>
diff --git a/packages/frontend/src/components/MkSwitch.button.vue b/packages/frontend/src/components/MkSwitch.button.vue
index 263b883567..cb1283f44d 100644
--- a/packages/frontend/src/components/MkSwitch.button.vue
+++ b/packages/frontend/src/components/MkSwitch.button.vue
@@ -11,7 +11,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 		[$style.buttonChecked]: checked,
 		[$style.buttonDisabled]: props.disabled
 	}"
-	data-cy-switch-toggle
+	data-testid="switch-toggle"
 	@click.prevent.stop="toggle"
 >
 	<div :class="{ [$style.knob]: true, [$style.knobChecked]: checked }"></div>
diff --git a/packages/frontend/src/components/MkUserSetupDialog.Profile.vue b/packages/frontend/src/components/MkUserSetupDialog.Profile.vue
index 95449dd0eb..2ec4f464fb 100644
--- a/packages/frontend/src/components/MkUserSetupDialog.Profile.vue
+++ b/packages/frontend/src/components/MkUserSetupDialog.Profile.vue
@@ -17,11 +17,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 		</div>
 	</FormSlot>
 
-	<MkInput v-model="name" :max="30" manualSave data-cy-user-setup-user-name>
+	<MkInput v-model="name" :max="30" manualSave data-testid="user-setup-user-name">
 		<template #label>{{ i18n.ts._profile.name }}</template>
 	</MkInput>
 
-	<MkTextarea v-model="description" :max="500" tall manualSave data-cy-user-setup-user-description>
+	<MkTextarea v-model="description" :max="500" tall manualSave data-testid="user-setup-user-description">
 		<template #label>{{ i18n.ts._profile.description }}</template>
 	</MkTextarea>
 
diff --git a/packages/frontend/src/components/MkUserSetupDialog.vue b/packages/frontend/src/components/MkUserSetupDialog.vue
index b4ef35c221..6dfa35e8bb 100644
--- a/packages/frontend/src/components/MkUserSetupDialog.vue
+++ b/packages/frontend/src/components/MkUserSetupDialog.vue
@@ -8,7 +8,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	ref="dialog"
 	:width="500"
 	:height="550"
-	data-cy-user-setup
+	data-testid="user-setup-dialog"
 	@close="close(true)"
 	@closed="emit('closed')"
 >
@@ -38,7 +38,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 							<i class="ti ti-confetti" style="display: block; margin: auto; font-size: 3em; color: var(--MI_THEME-accent);"></i>
 							<div style="font-size: 120%;">{{ i18n.ts._initialAccountSetting.accountCreated }}</div>
 							<div>{{ i18n.ts._initialAccountSetting.letsStartAccountSetup }}</div>
-							<MkButton primary rounded gradate style="margin: 16px auto 0 auto;" data-cy-user-setup-continue @click="page++">{{ i18n.ts._initialAccountSetting.profileSetting }} <i class="ti ti-arrow-right"></i></MkButton>
+							<MkButton primary rounded gradate style="margin: 16px auto 0 auto;" data-testid="user-setup-continue" @click="page++">{{ i18n.ts._initialAccountSetting.profileSetting }} <i class="ti ti-arrow-right"></i></MkButton>
 							<MkButton style="margin: 0 auto;" transparent rounded @click="later(true)">{{ i18n.ts.later }}</MkButton>
 						</div>
 					</div>
@@ -52,8 +52,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 						</div>
 						<div :class="$style.pageFooter">
 							<div class="_buttonsCenter">
-								<MkButton rounded data-cy-user-setup-back @click="page--"><i class="ti ti-arrow-left"></i> {{ i18n.ts.goBack }}</MkButton>
-								<MkButton primary rounded gradate data-cy-user-setup-continue @click="page++">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
+								<MkButton rounded data-testid="user-setup-back" @click="page--"><i class="ti ti-arrow-left"></i> {{ i18n.ts.goBack }}</MkButton>
+								<MkButton primary rounded gradate data-testid="user-setup-continue" @click="page++">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
 							</div>
 						</div>
 					</div>
@@ -67,8 +67,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 						</div>
 						<div :class="$style.pageFooter">
 							<div class="_buttonsCenter">
-								<MkButton rounded data-cy-user-setup-back @click="page--"><i class="ti ti-arrow-left"></i> {{ i18n.ts.goBack }}</MkButton>
-								<MkButton primary rounded gradate data-cy-user-setup-continue @click="page++">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
+								<MkButton rounded data-testid="user-setup-back" @click="page--"><i class="ti ti-arrow-left"></i> {{ i18n.ts.goBack }}</MkButton>
+								<MkButton primary rounded gradate data-testid="user-setup-continue" @click="page++">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
 							</div>
 						</div>
 					</div>
@@ -81,8 +81,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 					</div>
 					<div :class="$style.pageFooter">
 						<div class="_buttonsCenter">
-							<MkButton rounded data-cy-user-setup-back @click="page--"><i class="ti ti-arrow-left"></i> {{ i18n.ts.goBack }}</MkButton>
-							<MkButton primary rounded gradate style="" data-cy-user-setup-continue @click="page++">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
+							<MkButton rounded data-testid="user-setup-back" @click="page--"><i class="ti ti-arrow-left"></i> {{ i18n.ts.goBack }}</MkButton>
+							<MkButton primary rounded gradate style="" data-testid="user-setup-continue" @click="page++">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
 						</div>
 					</div>
 				</div>
@@ -96,8 +96,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 							<div style="padding: 0 16px;">{{ i18n.tsx._initialAccountSetting.pushNotificationDescription({ name: instance.name ?? host }) }}</div>
 							<MkPushNotificationAllowButton primary showOnlyToRegister style="margin: 0 auto;"/>
 							<div class="_buttonsCenter" style="margin-top: 16px;">
-								<MkButton rounded data-cy-user-setup-back @click="page--"><i class="ti ti-arrow-left"></i> {{ i18n.ts.goBack }}</MkButton>
-								<MkButton primary rounded gradate data-cy-user-setup-continue @click="page++">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
+								<MkButton rounded data-testid="user-setup-back" @click="page--"><i class="ti ti-arrow-left"></i> {{ i18n.ts.goBack }}</MkButton>
+								<MkButton primary rounded gradate data-testid="user-setup-continue" @click="page++">{{ i18n.ts.continue }} <i class="ti ti-arrow-right"></i></MkButton>
 							</div>
 						</div>
 					</div>
@@ -112,11 +112,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 							<div style="font-size: 120%;">{{ i18n.ts._initialAccountSetting.initialAccountSettingCompleted }}</div>
 							<div>{{ i18n.tsx._initialAccountSetting.youCanContinueTutorial({ name: instance.name ?? host }) }}</div>
 							<div class="_buttonsCenter" style="margin-top: 16px;">
-								<MkButton rounded primary gradate data-cy-user-setup-continue @click="launchTutorial()">{{ i18n.ts._initialAccountSetting.startTutorial }} <i class="ti ti-arrow-right"></i></MkButton>
+								<MkButton rounded primary gradate data-testid="user-setup-continue" @click="launchTutorial()">{{ i18n.ts._initialAccountSetting.startTutorial }} <i class="ti ti-arrow-right"></i></MkButton>
 							</div>
 							<div class="_buttonsCenter">
-								<MkButton rounded data-cy-user-setup-back @click="page--"><i class="ti ti-arrow-left"></i> {{ i18n.ts.goBack }}</MkButton>
-								<MkButton rounded primary data-cy-user-setup-continue @click="setupComplete()">{{ i18n.ts.close }}</MkButton>
+								<MkButton rounded data-testid="user-setup-back" @click="page--"><i class="ti ti-arrow-left"></i> {{ i18n.ts.goBack }}</MkButton>
+								<MkButton rounded primary data-testid="user-setup-continue" @click="setupComplete()">{{ i18n.ts.close }}</MkButton>
 							</div>
 						</div>
 					</div>
diff --git a/packages/frontend/src/components/MkVisitorDashboard.vue b/packages/frontend/src/components/MkVisitorDashboard.vue
index a903752a53..db04cf3341 100644
--- a/packages/frontend/src/components/MkVisitorDashboard.vue
+++ b/packages/frontend/src/components/MkVisitorDashboard.vue
@@ -24,9 +24,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<MkInfo v-else-if="instance.federation === 'none'" warn>{{ i18n.ts.federationDisabled }}</MkInfo>
 			</div>
 			<div class="_gaps_s" :class="$style.mainActions">
-				<MkButton :class="$style.mainAction" full rounded gradate data-cy-signup style="margin-right: 12px;" @click="signup()">{{ i18n.ts.joinThisServer }}</MkButton>
+				<MkButton :class="$style.mainAction" full rounded gradate data-testid="signup" style="margin-right: 12px;" @click="signup()">{{ i18n.ts.joinThisServer }}</MkButton>
 				<MkButton :class="$style.mainAction" full rounded type="a" target="_blank" rel="noopener" href="https://misskey-hub.net/servers/">{{ i18n.ts.exploreOtherServers }}</MkButton>
-				<MkButton :class="$style.mainAction" full rounded data-cy-signin @click="signin()">{{ i18n.ts.login }}</MkButton>
+				<MkButton :class="$style.mainAction" full rounded data-testid="signin" @click="signin()">{{ i18n.ts.login }}</MkButton>
 			</div>
 		</div>
 	</div>
diff --git a/packages/frontend/src/components/MkWidgets.vue b/packages/frontend/src/components/MkWidgets.vue
index a27613c24c..5b2482a01f 100644
--- a/packages/frontend/src/components/MkWidgets.vue
+++ b/packages/frontend/src/components/MkWidgets.vue
@@ -7,10 +7,10 @@ SPDX-License-Identifier: AGPL-3.0-only
 <div :class="$style.root" class="_gaps_s">
 	<template v-if="edit">
 		<header :class="$style.editHeader">
-			<MkSelect v-model="widgetAdderSelected" :items="widgetAdderSelectedDef" style="margin-bottom: var(--MI-margin)" data-cy-widget-select>
+			<MkSelect v-model="widgetAdderSelected" :items="widgetAdderSelectedDef" style="margin-bottom: var(--MI-margin)" data-testid="widget-select">
 				<template #label>{{ i18n.ts.selectWidget }}</template>
 			</MkSelect>
-			<MkButton inline primary data-cy-widget-add @click="addWidget"><i class="ti ti-plus"></i> {{ i18n.ts.add }}</MkButton>
+			<MkButton inline primary data-testid="widget-add" @click="addWidget"><i class="ti ti-plus"></i> {{ i18n.ts.add }}</MkButton>
 			<MkButton inline @click="emit('exit')">{{ i18n.ts.close }}</MkButton>
 		</header>
 		<MkDraggable
@@ -21,9 +21,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 			@update:modelValue="v => emit('updateWidgets', v)"
 		>
 			<template #default="{ item }">
-				<div :class="[$style.widget, $style.customizeContainer]" data-cy-customize-container>
+				<div :class="[$style.widget, $style.customizeContainer]" data-testid="customize-container">
 					<button :class="$style.customizeContainerConfig" class="_button" @click.prevent.stop="configWidget(item.id)"><i class="ti ti-settings"></i></button>
-					<button :class="$style.customizeContainerRemove" data-cy-customize-container-remove class="_button" @click.prevent.stop="removeWidget(item)"><i class="ti ti-x"></i></button>
+					<button :class="$style.customizeContainerRemove" data-testid="customize-container-remove" class="_button" @click.prevent.stop="removeWidget(item)"><i class="ti ti-x"></i></button>
 					<component :is="`widget-${item.name}`" :ref="(el: any) => widgetRefs[item.id] = el" :class="$style.customizeContainerHandleWidget" :widget="item" @updateProps="updateWidget(item.id, $event)"/>
 				</div>
 			</template>
diff --git a/packages/frontend/src/pages/signup-complete.vue b/packages/frontend/src/pages/signup-complete.vue
index 8a907c9066..59334d6dd5 100644
--- a/packages/frontend/src/pages/signup-complete.vue
+++ b/packages/frontend/src/pages/signup-complete.vue
@@ -13,7 +13,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 			<div class="_gaps_m" style="padding: 32px;">
 				<div>{{ i18n.tsx.clickToFinishEmailVerification({ ok: i18n.ts.gotIt }) }}</div>
 				<div>
-					<MkButton gradate large rounded type="submit" :disabled="submitting" data-cy-admin-ok style="margin: 0 auto;">
+					<MkButton gradate large rounded type="submit" :disabled="submitting" data-testid="admin-ok" style="margin: 0 auto;">
 						{{ submitting ? i18n.ts.processing : i18n.ts.gotIt }}<MkEllipsis v-if="submitting"/>
 					</MkButton>
 				</div>
diff --git a/packages/frontend/src/pages/welcome.setup.vue b/packages/frontend/src/pages/welcome.setup.vue
index 3a4a558605..0c06f962cd 100644
--- a/packages/frontend/src/pages/welcome.setup.vue
+++ b/packages/frontend/src/pages/welcome.setup.vue
@@ -53,21 +53,21 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<div><b>{{ i18n.ts._serverSetupWizard.installCompleted }}</b></div>
 						<div>{{ i18n.ts._serverSetupWizard.firstCreateAccount }}</div>
 					</div>
-					<MkInput v-model="setupPassword" type="password" data-cy-admin-initial-password>
+					<MkInput v-model="setupPassword" type="password" data-testid="admin-initial-password">
 						<template #label>{{ i18n.ts.initialPasswordForSetup }} <div v-tooltip:dialog="i18n.ts.initialPasswordForSetupDescription" class="_button _help"><i class="ti ti-help-circle"></i></div></template>
 						<template #prefix><i class="ti ti-lock"></i></template>
 					</MkInput>
-					<MkInput v-model="username" pattern="^[a-zA-Z0-9_]{1,20}$" :spellcheck="false" required data-cy-admin-username>
+					<MkInput v-model="username" pattern="^[a-zA-Z0-9_]{1,20}$" :spellcheck="false" required data-testid="admin-username">
 						<template #label>{{ i18n.ts.username }} <div v-tooltip:dialog="i18n.ts.usernameInfo" class="_button _help"><i class="ti ti-help-circle"></i></div></template>
 						<template #prefix>@</template>
 						<template #suffix>@{{ host }}</template>
 					</MkInput>
-					<MkInput v-model="password" type="password" data-cy-admin-password>
+					<MkInput v-model="password" type="password" data-testid="admin-password">
 						<template #label>{{ i18n.ts.password }}</template>
 						<template #prefix><i class="ti ti-lock"></i></template>
 					</MkInput>
 					<div>
-						<MkButton gradate large rounded :disabled="accountCreating" data-cy-admin-ok style="margin: 0 auto;" type="submit">
+						<MkButton gradate large rounded :disabled="accountCreating" data-testid="admin-ok" style="margin: 0 auto;" type="submit">
 							{{ accountCreating ? i18n.ts.processing : i18n.ts.next }}<MkEllipsis v-if="accountCreating"/>
 						</MkButton>
 					</div>
@@ -76,7 +76,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<div style="text-align: center;" class="_gaps_s">
 						<div><b>{{ i18n.ts._serverSetupWizard.accountCreated }}</b></div>
 					</div>
-					<MkButton gradate large rounded data-cy-next style="margin: 0 auto;" @click="step++">
+					<MkButton gradate large rounded data-testid="next" style="margin: 0 auto;" @click="step++">
 						{{ i18n.ts.next }}
 					</MkButton>
 				</div>
@@ -112,7 +112,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 						<MkLink target="_blank" url="https://misskey-hub.net/docs/donate/" style="margin: 0 auto;">{{ i18n.ts.learnMore }}</MkLink>
 					</div>
 					<div class="_buttonsCenter">
-						<MkButton gradate large rounded data-cy-next style="margin: 0 auto;" @click="finish">
+						<MkButton gradate large rounded data-testid="next" style="margin: 0 auto;" @click="finish">
 							{{ i18n.ts.start }}
 						</MkButton>
 					</div>
diff --git a/packages/frontend/src/ui/_common_/navbar.vue b/packages/frontend/src/ui/_common_/navbar.vue
index d0c183763a..55758acc9a 100644
--- a/packages/frontend/src/ui/_common_/navbar.vue
+++ b/packages/frontend/src/ui/_common_/navbar.vue
@@ -61,7 +61,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<i v-if="store.r.realtimeMode.value" class="ti ti-bolt ti-fw"></i>
 				<i v-else class="ti ti-bolt-off ti-fw"></i>
 			</button>
-			<button v-tooltip.noDelay.right="i18n.ts.note" class="_button" :class="[$style.post]" data-cy-open-post-form @click="() => { os.post(); }">
+			<button v-tooltip.noDelay.right="i18n.ts.note" class="_button" :class="[$style.post]" data-testid="open-post-form" @click="() => { os.post(); }">
 				<i class="ti ti-pencil ti-fw" :class="$style.postIcon"></i><span :class="$style.postText">{{ i18n.ts.note }}</span>
 			</button>
 			<button v-if="$i != null" v-tooltip.noDelay.right="`${i18n.ts.account}: @${$i.username}`" class="_button" :class="[$style.account]" @click="openAccountMenu">
diff --git a/packages/frontend/src/ui/_common_/widgets.vue b/packages/frontend/src/ui/_common_/widgets.vue
index 4087c4d517..0c50446e0f 100644
--- a/packages/frontend/src/ui/_common_/widgets.vue
+++ b/packages/frontend/src/ui/_common_/widgets.vue
@@ -16,7 +16,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	/>
 
 	<button v-if="editMode" class="_textButton" style="font-size: 0.9em;" @click="editMode = false"><i class="ti ti-check"></i> {{ i18n.ts.editWidgetsExit }}</button>
-	<button v-else class="_textButton" data-cy-widget-edit :class="$style.edit" style="font-size: 0.9em; margin-top: 16px;" @click="editMode = true"><i class="ti ti-pencil"></i> {{ i18n.ts.editWidgets }}</button>
+	<button v-else class="_textButton" data-testid="widget-edit" :class="$style.edit" style="font-size: 0.9em; margin-top: 16px;" @click="editMode = true"><i class="ti ti-pencil"></i> {{ i18n.ts.editWidgets }}</button>
 </div>
 </template>
 
diff --git a/packages/frontend/src/widgets/WidgetActivity.vue b/packages/frontend/src/widgets/WidgetActivity.vue
index 3d0f4657b1..5c4d881bfe 100644
--- a/packages/frontend/src/widgets/WidgetActivity.vue
+++ b/packages/frontend/src/widgets/WidgetActivity.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkContainer :showHeader="widgetProps.showHeader" :naked="widgetProps.transparent" data-cy-mkw-activity class="mkw-activity">
+<MkContainer :showHeader="widgetProps.showHeader" :naked="widgetProps.transparent" data-testid="mkw-activity" class="mkw-activity">
 	<template #icon><i class="ti ti-chart-line"></i></template>
 	<template #header>{{ i18n.ts._widgets.activity }}</template>
 	<template #func="{ buttonStyleClass }"><button class="_button" :class="buttonStyleClass" @click="toggleView()"><i class="ti ti-selector"></i></button></template>
diff --git a/packages/frontend/src/widgets/WidgetAichan.vue b/packages/frontend/src/widgets/WidgetAichan.vue
index c2a41b6257..0b71707d11 100644
--- a/packages/frontend/src/widgets/WidgetAichan.vue
+++ b/packages/frontend/src/widgets/WidgetAichan.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkContainer :naked="widgetProps.transparent" :showHeader="false" data-cy-mkw-aichan class="mkw-aichan">
+<MkContainer :naked="widgetProps.transparent" :showHeader="false" data-testid="mkw-aichan" class="mkw-aichan">
 	<iframe ref="live2d" :class="$style.root" src="https://misskey-dev.github.io/mascot-web/?scale=1.5&y=1.1&eyeY=100" @click="touched"></iframe>
 </MkContainer>
 </template>
diff --git a/packages/frontend/src/widgets/WidgetAiscript.vue b/packages/frontend/src/widgets/WidgetAiscript.vue
index c6cafb270f..f47599e52b 100644
--- a/packages/frontend/src/widgets/WidgetAiscript.vue
+++ b/packages/frontend/src/widgets/WidgetAiscript.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkContainer :showHeader="widgetProps.showHeader" data-cy-mkw-aiscript class="mkw-aiscript">
+<MkContainer :showHeader="widgetProps.showHeader" data-testid="mkw-aiscript" class="mkw-aiscript">
 	<template #icon><i class="ti ti-terminal-2"></i></template>
 	<template #header>{{ i18n.ts._widgets.aiscript }}</template>
 
diff --git a/packages/frontend/src/widgets/WidgetButton.vue b/packages/frontend/src/widgets/WidgetButton.vue
index 223901390e..5682b5be07 100644
--- a/packages/frontend/src/widgets/WidgetButton.vue
+++ b/packages/frontend/src/widgets/WidgetButton.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div data-cy-mkw-button class="mkw-button">
+<div data-testid="mkw-button" class="mkw-button">
 	<MkButton :primary="widgetProps.colored" full @click="run">
 		{{ widgetProps.label }}
 	</MkButton>
diff --git a/packages/frontend/src/widgets/WidgetCalendar.vue b/packages/frontend/src/widgets/WidgetCalendar.vue
index 28336cbe09..8ac0e64802 100644
--- a/packages/frontend/src/widgets/WidgetCalendar.vue
+++ b/packages/frontend/src/widgets/WidgetCalendar.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div :class="[$style.root, { _panel: !widgetProps.transparent }]" data-cy-mkw-calendar>
+<div :class="[$style.root, { _panel: !widgetProps.transparent }]" data-testid="mkw-calendar">
 	<div :class="[$style.calendar, { [$style.isHoliday]: isHoliday }]">
 		<p :class="$style.monthAndYear">
 			<span :class="$style.year">{{ i18n.tsx.yearX({ year }) }}</span>
diff --git a/packages/frontend/src/widgets/WidgetClock.vue b/packages/frontend/src/widgets/WidgetClock.vue
index 80f312e7c4..b85bd746d9 100644
--- a/packages/frontend/src/widgets/WidgetClock.vue
+++ b/packages/frontend/src/widgets/WidgetClock.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkContainer :naked="widgetProps.transparent" :showHeader="false" data-cy-mkw-clock>
+<MkContainer :naked="widgetProps.transparent" :showHeader="false" data-testid="mkw-clock">
 	<div
 		:class="[$style.root, {
 			[$style.small]: widgetProps.size === 'small',
diff --git a/packages/frontend/src/widgets/WidgetDigitalClock.vue b/packages/frontend/src/widgets/WidgetDigitalClock.vue
index d50d4aef62..511fda5892 100644
--- a/packages/frontend/src/widgets/WidgetDigitalClock.vue
+++ b/packages/frontend/src/widgets/WidgetDigitalClock.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div data-cy-mkw-digitalClock class="_monospace" :class="[$style.root, { _panel: !widgetProps.transparent }]" :style="{ fontSize: `${widgetProps.fontSize}em` }">
+<div data-testid="mkw-digitalClock" class="_monospace" :class="[$style.root, { _panel: !widgetProps.transparent }]" :style="{ fontSize: `${widgetProps.fontSize}em` }">
 	<div v-if="widgetProps.showLabel" :class="$style.label">{{ tzAbbrev }}</div>
 	<div>
 		<MkDigitalClock :showMs="widgetProps.showMs" :offset="tzOffset"/>
diff --git a/packages/frontend/src/widgets/WidgetFederation.vue b/packages/frontend/src/widgets/WidgetFederation.vue
index cf2c2f0ab7..072601602c 100644
--- a/packages/frontend/src/widgets/WidgetFederation.vue
+++ b/packages/frontend/src/widgets/WidgetFederation.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkContainer :showHeader="widgetProps.showHeader" data-cy-mkw-federation class="mkw-federation">
+<MkContainer :showHeader="widgetProps.showHeader" data-testid="mkw-federation" class="mkw-federation">
 	<template #icon><i class="ti ti-whirl"></i></template>
 	<template #header>{{ i18n.ts._widgets.federation }}</template>
 
diff --git a/packages/frontend/src/widgets/WidgetJobQueue.vue b/packages/frontend/src/widgets/WidgetJobQueue.vue
index 1727ea9b74..7ddabf6404 100644
--- a/packages/frontend/src/widgets/WidgetJobQueue.vue
+++ b/packages/frontend/src/widgets/WidgetJobQueue.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div data-cy-mkw-jobQueue class="mkw-jobQueue _monospace" :class="{ _panel: !widgetProps.transparent }">
+<div data-testid="mkw-jobQueue" class="mkw-jobQueue _monospace" :class="{ _panel: !widgetProps.transparent }">
 	<div class="inbox">
 		<div class="label">Inbox queue<i v-if="current.inbox.waiting > 0" class="ti ti-alert-triangle icon"></i></div>
 		<div class="values">
diff --git a/packages/frontend/src/widgets/WidgetMemo.vue b/packages/frontend/src/widgets/WidgetMemo.vue
index fd5b56991e..6c61f13976 100644
--- a/packages/frontend/src/widgets/WidgetMemo.vue
+++ b/packages/frontend/src/widgets/WidgetMemo.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkContainer :showHeader="widgetProps.showHeader" data-cy-mkw-memo class="mkw-memo">
+<MkContainer :showHeader="widgetProps.showHeader" data-testid="mkw-memo" class="mkw-memo">
 	<template #icon><i class="ti ti-note"></i></template>
 	<template #header>{{ i18n.ts._widgets.memo }}</template>
 
diff --git a/packages/frontend/src/widgets/WidgetNotifications.vue b/packages/frontend/src/widgets/WidgetNotifications.vue
index 48a29d6145..d11ef72b7d 100644
--- a/packages/frontend/src/widgets/WidgetNotifications.vue
+++ b/packages/frontend/src/widgets/WidgetNotifications.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkContainer :style="`height: ${widgetProps.height}px;`" :showHeader="widgetProps.showHeader" :scrollable="true" data-cy-mkw-notifications class="mkw-notifications">
+<MkContainer :style="`height: ${widgetProps.height}px;`" :showHeader="widgetProps.showHeader" :scrollable="true" data-testid="mkw-notifications" class="mkw-notifications">
 	<template #icon><i class="ti ti-bell"></i></template>
 	<template #header>{{ i18n.ts.notifications }}</template>
 	<template #func="{ buttonStyleClass }"><button class="_button" :class="buttonStyleClass" @click="configureNotification()"><i class="ti ti-settings"></i></button></template>
diff --git a/packages/frontend/src/widgets/WidgetOnlineUsers.vue b/packages/frontend/src/widgets/WidgetOnlineUsers.vue
index b0bb4b47b1..e90a54a880 100644
--- a/packages/frontend/src/widgets/WidgetOnlineUsers.vue
+++ b/packages/frontend/src/widgets/WidgetOnlineUsers.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div data-cy-mkw-onlineUsers :class="[$style.root, { _panel: !widgetProps.transparent, [$style.pad]: !widgetProps.transparent }]">
+<div data-testid="mkw-onlineUsers" :class="[$style.root, { _panel: !widgetProps.transparent, [$style.pad]: !widgetProps.transparent }]">
 	<span :class="$style.text">
 		<I18n v-if="onlineUsersCount" :src="i18n.ts.onlineUsersCount" textTag="span">
 			<template #n><b style="color: #41b781;">{{ number(onlineUsersCount) }}</b></template>
diff --git a/packages/frontend/src/widgets/WidgetPhotos.vue b/packages/frontend/src/widgets/WidgetPhotos.vue
index 670e764c8c..b75dc8b3ea 100644
--- a/packages/frontend/src/widgets/WidgetPhotos.vue
+++ b/packages/frontend/src/widgets/WidgetPhotos.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkContainer :showHeader="widgetProps.showHeader" :naked="widgetProps.transparent" :class="$style.root" :data-transparent="widgetProps.transparent ? true : null" data-cy-mkw-photos class="mkw-photos">
+<MkContainer :showHeader="widgetProps.showHeader" :naked="widgetProps.transparent" :class="$style.root" :data-transparent="widgetProps.transparent ? true : null" data-testid="mkw-photos" class="mkw-photos">
 	<template #icon><i class="ti ti-camera"></i></template>
 	<template #header>{{ i18n.ts._widgets.photos }}</template>
 
diff --git a/packages/frontend/src/widgets/WidgetPostForm.vue b/packages/frontend/src/widgets/WidgetPostForm.vue
index 9f464cac95..ddfdc0732a 100644
--- a/packages/frontend/src/widgets/WidgetPostForm.vue
+++ b/packages/frontend/src/widgets/WidgetPostForm.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkPostForm data-cy-mkw-postForm class="_panel mkw-post-form" :fixed="true" :autofocus="false"/>
+<MkPostForm data-testid="mkw-postForm" class="_panel mkw-post-form" :fixed="true" :autofocus="false"/>
 </template>
 
 <script lang="ts" setup>
diff --git a/packages/frontend/src/widgets/WidgetRss.vue b/packages/frontend/src/widgets/WidgetRss.vue
index 2495c5a6e9..4a9842d6e6 100644
--- a/packages/frontend/src/widgets/WidgetRss.vue
+++ b/packages/frontend/src/widgets/WidgetRss.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkContainer :showHeader="widgetProps.showHeader" data-cy-mkw-rss class="mkw-rss">
+<MkContainer :showHeader="widgetProps.showHeader" data-testid="mkw-rss" class="mkw-rss">
 	<template #icon><i class="ti ti-rss"></i></template>
 	<template #header>RSS</template>
 	<template #func="{ buttonStyleClass }"><button class="_button" :class="buttonStyleClass" @click="configure"><i class="ti ti-settings"></i></button></template>
diff --git a/packages/frontend/src/widgets/WidgetSlideshow.vue b/packages/frontend/src/widgets/WidgetSlideshow.vue
index b812c89e08..aff48e8705 100644
--- a/packages/frontend/src/widgets/WidgetSlideshow.vue
+++ b/packages/frontend/src/widgets/WidgetSlideshow.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<div data-cy-mkw-slideshow class="kvausudm _panel mkw-slideshow" :style="{ height: widgetProps.height + 'px' }">
+<div data-testid="mkw-slideshow" class="kvausudm _panel mkw-slideshow" :style="{ height: widgetProps.height + 'px' }">
 	<div @click="choose">
 		<p v-if="widgetProps.folderId == null">
 			{{ i18n.ts.folder }}
diff --git a/packages/frontend/src/widgets/WidgetTimeline.vue b/packages/frontend/src/widgets/WidgetTimeline.vue
index 83b8e7ccbc..c4561d4f67 100644
--- a/packages/frontend/src/widgets/WidgetTimeline.vue
+++ b/packages/frontend/src/widgets/WidgetTimeline.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkContainer :showHeader="widgetProps.showHeader" :style="`height: ${widgetProps.height}px;`" :scrollable="true" data-cy-mkw-timeline class="mkw-timeline">
+<MkContainer :showHeader="widgetProps.showHeader" :style="`height: ${widgetProps.height}px;`" :scrollable="true" data-testid="mkw-timeline" class="mkw-timeline">
 	<template #icon>
 		<i v-if="isBasicTimeline(widgetProps.src)" :class="basicTimelineIconClass(widgetProps.src)"></i>
 		<i v-else-if="widgetProps.src === 'list'" class="ti ti-list"></i>
diff --git a/packages/frontend/src/widgets/WidgetTrends.vue b/packages/frontend/src/widgets/WidgetTrends.vue
index 498129305b..e44e7fc710 100644
--- a/packages/frontend/src/widgets/WidgetTrends.vue
+++ b/packages/frontend/src/widgets/WidgetTrends.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<MkContainer :showHeader="widgetProps.showHeader" data-cy-mkw-trends class="mkw-trends">
+<MkContainer :showHeader="widgetProps.showHeader" data-testid="mkw-trends" class="mkw-trends">
 	<template #icon><i class="ti ti-hash"></i></template>
 	<template #header>{{ i18n.ts._widgets.trends }}</template>
 
diff --git a/packages/frontend/src/widgets/server-metric/index.vue b/packages/frontend/src/widgets/server-metric/index.vue
index 5d93c6a982..f8c254e72a 100644
--- a/packages/frontend/src/widgets/server-metric/index.vue
+++ b/packages/frontend/src/widgets/server-metric/index.vue
@@ -9,7 +9,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<template #header>{{ i18n.ts._widgets.serverMetric }}</template>
 	<template #func="{ buttonStyleClass }"><button class="_button" :class="buttonStyleClass" @click="toggleView()"><i class="ti ti-selector"></i></button></template>
 
-	<div v-if="meta" data-cy-mkw-serverMetric class="mkw-serverMetric">
+	<div v-if="meta" data-testid="mkw-serverMetric" class="mkw-serverMetric">
 		<XCpuMemory v-if="widgetProps.view === 0" :connection="connection" :meta="meta"/>
 		<XNet v-else-if="widgetProps.view === 1" :connection="connection" :meta="meta"/>
 		<XCpu v-else-if="widgetProps.view === 2" :connection="connection" :meta="meta"/>
diff --git a/packages/frontend/test/e2e/browser-commands.ts b/packages/frontend/test/e2e/browser-commands.ts
index 6847fd98cd..993c38bb39 100644
--- a/packages/frontend/test/e2e/browser-commands.ts
+++ b/packages/frontend/test/e2e/browser-commands.ts
@@ -3,7 +3,7 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import type { APIRequestContext, Page } from 'playwright';
+import type { APIRequestContext, Page, Locator } from 'playwright';
 import type { BrowserCommand } from 'vitest/node';
 import '@vitest/browser-playwright';
 
@@ -25,6 +25,18 @@ async function resetState(request: APIRequestContext): Promise<void> {
 	await assertOk(response.status(), await response.text(), '/api/reset-db');
 }
 
+function locateMkInput(page: Page, testId: string): Locator {
+	return page.locator(`[data-testid="${testId}"] input`);
+}
+
+function locateMkTextarea(page: Page, testId: string): Locator {
+	return page.locator(`[data-testid="${testId}"] textarea`);
+}
+
+function locateMkSwitch(page: Page, testId: string): Locator {
+	return page.locator(`[data-testid="${testId}"] [data-testid="switch-toggle"]`);
+}
+
 async function registerUser(
 	request: APIRequestContext,
 	username: string,
@@ -57,17 +69,17 @@ async function visitHome(page: Page): Promise<void> {
 async function signInFromTopPage(page: Page, username: string, password: string): Promise<void> {
 	await page.getByTestId('signin').click();
 	await page.getByTestId('signin-page-input').waitFor({ state: 'visible', timeout: 10_000 });
-	await page.locator('[data-cy-signin-username] input').fill(username);
+	await locateMkInput(page, 'signin-username').fill(username);
 	await page.keyboard.press('Enter');
 	await page.getByTestId('signin-page-password').waitFor({ state: 'visible', timeout: 10_000 });
-	await page.locator('[data-cy-signin-password] input').fill(password);
+	await locateMkInput(page, 'signin-password').fill(password);
 	const signinResponse = waitApiResponse(page, '/api/signin-flow');
 	await page.keyboard.press('Enter');
 	await signinResponse;
 }
 
 async function dismissAccountSetupWizard(page: Page): Promise<void> {
-	await page.locator('[data-cy-user-setup] [data-cy-modal-window-close]').click({ timeout: 30_000 });
+	await page.locator('[data-testid="user-setup-dialog"] [data-testid="modal-window-close"]').click({ timeout: 30_000 });
 	await page.getByTestId('modal-dialog-ok').click();
 }
 
@@ -99,15 +111,15 @@ async function runBeforeSetupLoads(page: Page): Promise<void> {
 async function runSetupInstance(page: Page): Promise<void> {
 	await visitHome(page);
 
-	await page.locator('[data-cy-admin-initial-password] input').fill(ADMIN_SETUP_PASSWORD);
-	await page.locator('[data-cy-admin-username] input').fill('admin');
-	await page.locator('[data-cy-admin-password] input').fill('admin1234');
+	await locateMkInput(page, 'admin-initial-password').fill(ADMIN_SETUP_PASSWORD);
+	await locateMkInput(page, 'admin-username').fill('admin');
+	await locateMkInput(page, 'admin-password').fill('admin1234');
 	const signupResponse = waitApiResponse(page, '/api/admin/accounts/create');
 	await page.getByTestId('admin-ok').click();
 	await signupResponse;
 
 	await page.getByTestId('next').click();
-	await page.locator('[data-cy-server-name] input').fill('Testskey');
+	await locateMkInput(page, 'server-setup-server-name').fill('Testskey');
 	const updateMetaResponse = waitApiResponse(page, '/api/admin/update-meta');
 	await page.getByTestId('server-setup-wizard-apply').click();
 	await updateMetaResponse;
@@ -127,14 +139,14 @@ async function runSignup(page: Page, request: APIRequestContext): Promise<void>
 	if (!await page.getByTestId('signup-rules-continue').isDisabled()) {
 		throw new Error('signup-rules-continue should be disabled before agreement');
 	}
-	await page.locator('[data-cy-signup-rules-notes-agree] [data-cy-switch-toggle]').click();
+	await locateMkSwitch(page, 'signup-rules-notes-agree').click();
 	await page.getByTestId('modal-dialog-ok').click();
 	await page.getByTestId('signup-rules-continue').click();
 
-	await page.locator('[data-cy-signup-username] input').fill('alice');
-	await page.locator('[data-cy-signup-password] input').fill('alice1234');
-	await page.locator('[data-cy-signup-password-retype] input').fill('alice1234');
-	await page.locator('[data-cy-signup-invitation-code] input').fill('test-invitation-code');
+	await locateMkInput(page, 'signup-username').fill('alice');
+	await locateMkInput(page, 'signup-password').fill('alice1234');
+	await locateMkInput(page, 'signup-password-retype').fill('alice1234');
+	await locateMkInput(page, 'signup-invitation-code').fill('test-invitation-code');
 	const signupResponse = waitApiResponse(page, '/api/signup');
 	await page.getByTestId('signup-submit').click();
 	await signupResponse;
@@ -146,12 +158,12 @@ async function runSignupDuplicated(page: Page, request: APIRequestContext): Prom
 	await visitHome(page);
 
 	await page.getByTestId('signup').click();
-	await page.locator('[data-cy-signup-rules-notes-agree] [data-cy-switch-toggle]').click();
+	await locateMkSwitch(page, 'signup-rules-notes-agree').click();
 	await page.getByTestId('modal-dialog-ok').click();
 	await page.getByTestId('signup-rules-continue').click();
-	await page.locator('[data-cy-signup-username] input').fill('alice');
-	await page.locator('[data-cy-signup-password] input').fill('alice1234');
-	await page.locator('[data-cy-signup-password-retype] input').fill('alice1234');
+	await locateMkInput(page, 'signup-username').fill('alice');
+	await locateMkInput(page, 'signup-password').fill('alice1234');
+	await locateMkInput(page, 'signup-password-retype').fill('alice1234');
 	if (!await page.getByTestId('signup-submit').isDisabled()) {
 		throw new Error('signup-submit should stay disabled for duplicated username');
 	}
@@ -178,7 +190,7 @@ async function runSuspend(page: Page, request: APIRequestContext): Promise<void>
 	await visitHome(page);
 	await page.getByTestId('signin').click();
 	await page.getByTestId('signin-page-input').waitFor({ state: 'visible', timeout: 10_000 });
-	await page.locator('[data-cy-signin-username] input').fill('alice');
+	await locateMkInput(page, 'signin-username').fill('alice');
 	await page.keyboard.press('Enter');
 	await page.getByText(/アカウントが凍結されています|This account has been suspended due to/).waitFor({ timeout: 10_000 });
 }
@@ -191,8 +203,8 @@ async function runAfterSignedInLoads(page: Page, request: APIRequestContext): Pr
 async function runAccountSetupWizard(page: Page, request: APIRequestContext): Promise<void> {
 	await prepareAfterSignedIn(page, request);
 	await page.getByTestId('user-setup-continue').click({ timeout: 30_000 });
-	await page.locator('[data-cy-user-setup-user-name] input').fill('ありす');
-	await page.locator('[data-cy-user-setup-user-description] textarea').fill('ほげ');
+	await locateMkInput(page, 'user-setup-user-name').fill('ありす');
+	await locateMkTextarea(page, 'user-setup-user-description').fill('ほげ');
 	await page.getByTestId('user-setup-continue').click();
 	await page.getByTestId('user-setup-continue').click();
 	await page.getByTestId('user-setup-continue').click();
@@ -205,20 +217,14 @@ async function runCreateNote(page: Page, request: APIRequestContext): Promise<vo
 	await page.getByTestId('open-post-form').waitFor({ state: 'visible' });
 	await page.getByTestId('open-post-form').click();
 	await page.getByTestId('post-form-text').fill('Hello, Misskey!');
-	await page.getByTestId('open-post-form-submit').click();
+	await page.getByTestId('post-form-submit').click();
 	await page.getByText('Hello, Misskey!').waitFor({ timeout: 15_000 });
 }
 
 async function runOpenNoteFormWithHotkey(page: Page, request: APIRequestContext): Promise<void> {
 	await prepareAfterUserSetup(page, request);
 	await page.getByTestId('open-post-form').waitFor({ state: 'visible' });
-	await page.evaluate(() => {
-		document.dispatchEvent(new KeyboardEvent('keydown', {
-			key: 'n',
-			code: 'KeyL',
-			bubbles: true,
-		}));
-	});
+	await page.keyboard.press('KeyN');
 	await page.getByTestId('post-form-text').waitFor({ state: 'visible' });
 	await page.keyboard.press('Escape');
 	await page.getByTestId('post-form-text').waitFor({ state: 'hidden' });