diff --git a/locales/en-US.yml b/locales/en-US.yml
index 55ae35807..ecb64e024 100644
--- a/locales/en-US.yml
+++ b/locales/en-US.yml
@@ -529,6 +529,7 @@ mediaListWithOneImageAppearance: "Height of media lists with one image only"
 limitTo: "Limit to {x}"
 noFollowRequests: "You don't have any pending follow requests"
 openImageInNewTab: "Open images in new tab"
+warnForMissingAltText: "Warn you when you forget to put alt text"
 dashboard: "Dashboard"
 local: "Local"
 remote: "Remote"
@@ -1046,6 +1047,9 @@ thisPostMayBeAnnoying: "This note may annoy others."
 thisPostMayBeAnnoyingHome: "Post to home timeline"
 thisPostMayBeAnnoyingCancel: "Cancel"
 thisPostMayBeAnnoyingIgnore: "Post anyway"
+thisPostIsMissingAltTextCancel: "Cancel"
+thisPostIsMissingAltTextIgnore: "Post anyway"
+thisPostIsMissingAltText: "One of the files attached to this post is missing alt text. Please ensure all the attachments have alt text."
 collapseRenotes: "Collapse renotes you've already seen"
 internalServerError: "Internal Server Error"
 internalServerErrorDescription: "The server has run into an unexpected error."
diff --git a/locales/index.d.ts b/locales/index.d.ts
index 8aa41332e..bd9c350b6 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -4211,6 +4211,18 @@ export interface Locale extends ILocale {
      * このまま投稿
      */
     "thisPostMayBeAnnoyingIgnore": string;
+    /**
+     * やめる
+     */
+    "thisPostIsMissingAltTextCancel": string;
+    /**
+     * このまま投稿
+     */
+    "thisPostIsMissingAltTextIgnore": string;
+    /**
+     * この投稿に添付されたファイルの 1 つに代替テキストがありません。すべての添付ファイルに代替テキストが含まれていることを確認してください。
+     */
+    "thisPostIsMissingAltText": string;
     /**
      * 見たことのあるリノートを省略して表示
      */
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 3037af73d..9fa66a8f1 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1048,6 +1048,9 @@ thisPostMayBeAnnoying: "この投稿は迷惑になる可能性があります
 thisPostMayBeAnnoyingHome: "ホームに投稿"
 thisPostMayBeAnnoyingCancel: "やめる"
 thisPostMayBeAnnoyingIgnore: "このまま投稿"
+thisPostIsMissingAltTextCancel: "やめる"
+thisPostIsMissingAltTextIgnore: "このまま投稿"
+thisPostIsMissingAltText: "この投稿に添付されたファイルの 1 つに代替テキストがありません。すべての添付ファイルに代替テキストが含まれていることを確認してください。"
 collapseRenotes: "見たことのあるリノートを省略して表示"
 internalServerError: "サーバー内部エラー"
 internalServerErrorDescription: "サーバー内部で予期しないエラーが発生しました。"
diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index 00e5f3966..27dc8a5f4 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -101,7 +101,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { inject, watch, nextTick, onMounted, onUnmounted, defineAsyncComponent, provide, shallowRef, ref, computed } from 'vue';
+import { inject, watch, nextTick, onMounted, onUnmounted, defineAsyncComponent, provide, shallowRef, ref, computed, toRaw } from 'vue';
 import * as mfm from 'mfm-js';
 import * as Misskey from 'misskey-js';
 import insertTextAtCursor from 'insert-text-at-cursor';
@@ -760,6 +760,31 @@ async function post(ev?: MouseEvent) {
 		}
 	}
 
+	if (defaultStore.state.warnMissingAltText) {
+		const filesData = toRaw(files.value);
+
+		const isMissingAltText = filesData.filter(
+			file => file.type.startsWith('image/') || file.type.startsWith('video/') || file.type.startsWith('audio/'),
+		).some(file => !file.comment);
+
+		if (isMissingAltText) {
+			const { canceled, result } = await os.actions({
+				type: 'warning',
+				text: i18n.ts.thisPostIsMissingAltText,
+				actions: [{
+					value: 'cancel',
+					text: i18n.ts.thisPostIsMissingAltTextCancel,
+				}, {
+					value: 'ignore',
+					text: i18n.ts.thisPostIsMissingAltTextIgnore,
+				}],
+			});
+
+			if (canceled) return;
+			if (result === 'cancel') return;
+		}
+	}
+
 	let postData = {
 		text: text.value === '' ? null : text.value,
 		// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
@@ -874,9 +899,9 @@ async function post(ev?: MouseEvent) {
 			type: 'error',
 			text: err.message + '\n' + (err as any).id,
 		});
-		emit("postError");
+		emit('postError');
 	});
-	emit("posting");
+	emit('posting');
 }
 
 function cancel() {
@@ -893,7 +918,7 @@ async function insertEmoji(ev: MouseEvent) {
 	os.openEmojiPicker(
 		(ev.currentTarget ?? ev.target) as HTMLElement,
 		{ asReactionPicker: false },
-		textareaEl.value
+		textareaEl.value,
 	);
 }
 
diff --git a/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts b/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts
index a818cd404..0bcd0d23f 100644
--- a/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts
+++ b/packages/frontend/src/components/global/MkMisskeyFlavoredMarkdown.ts
@@ -227,6 +227,22 @@ export default function (props: MfmProps, { emit }: { emit: SetupContext<MfmEven
 						}
 						return h(MkSparkle, {}, genEl(token.children, scale));
 					}
+					case 'fade': {
+						// Dont run with reduced motion on
+						if (!defaultStore.state.animation) {
+							style = '';
+							break;
+						}
+
+						const direction = token.props.args.out
+							? 'alternate-reverse'
+							: 'alternate';
+						const speed = validTime(token.props.args.speed) ?? '1.5s';
+						const delay = validTime(token.props.args.delay) ?? '0s';
+						const loop = safeParseFloat(token.props.args.loop) ?? 'infinite';
+						style = `animation: mfm-fade ${speed} ${delay} linear ${loop}; animation-direction: ${direction};`;
+						break;
+					}
 					case 'rotate': {
 						const degrees = safeParseFloat(token.props.args.deg) ?? 90;
 						style = `transform: rotate(${degrees}deg); transform-origin: center center;`;
@@ -239,6 +255,22 @@ export default function (props: MfmProps, { emit }: { emit: SetupContext<MfmEven
 						style = `transform: translateX(${x}em) translateY(${y}em);`;
 						break;
 					}
+					case 'crop': {
+						const top = Number.parseFloat(
+							(token.props.args.top ?? '0').toString(),
+						);
+						const right = Number.parseFloat(
+							(token.props.args.right ?? '0').toString(),
+						);
+						const bottom = Number.parseFloat(
+							(token.props.args.bottom ?? '0').toString(),
+						);
+						const left = Number.parseFloat(
+							(token.props.args.left ?? '0').toString(),
+						);
+						style = `clip-path: inset(${top}% ${right}% ${bottom}% ${left}%);`;
+						break;
+					}
 					case 'scale': {
 						if (!defaultStore.state.advancedMfm) {
 							style = '';
diff --git a/packages/frontend/src/const.ts b/packages/frontend/src/const.ts
index 32b0bb353..3f7ba0800 100644
--- a/packages/frontend/src/const.ts
+++ b/packages/frontend/src/const.ts
@@ -122,7 +122,7 @@ export const DEFAULT_SERVER_ERROR_IMAGE_URL = 'https://xn--931a.moe/assets/error
 export const DEFAULT_NOT_FOUND_IMAGE_URL = 'https://xn--931a.moe/assets/not-found.jpg';
 export const DEFAULT_INFO_IMAGE_URL = 'https://xn--931a.moe/assets/info.jpg';
 
-export const MFM_TAGS = ['tada', 'jelly', 'twitch', 'shake', 'spin', 'jump', 'bounce', 'flip', 'x2', 'x3', 'x4', 'scale', 'position', 'fg', 'bg', 'border', 'font', 'blur', 'rainbow', 'sparkle', 'rotate', 'ruby', 'unixtime'];
+export const MFM_TAGS = ['tada', 'jelly', 'twitch', 'shake', 'spin', 'jump', 'bounce', 'flip', 'x2', 'x3', 'x4', 'scale', 'position', 'fg', 'bg', 'border', 'font', 'blur', 'rainbow', 'sparkle', 'rotate', 'ruby', 'unixtime', 'crop', 'fade'];
 export const MFM_PARAMS: Record<typeof MFM_TAGS[number], string[]> = {
 	tada: ['speed=', 'delay='],
 	jelly: ['speed=', 'delay='],
@@ -146,4 +146,6 @@ export const MFM_PARAMS: Record<typeof MFM_TAGS[number], string[]> = {
 	rotate: ['deg='],
 	ruby: [],
 	unixtime: [],
+	fade: ['speed=', 'delay=', 'loop=', 'out'],
+	crop: ['top=', 'bottom=', 'left=', 'right='],
 };
diff --git a/packages/frontend/src/pages/settings/general.vue b/packages/frontend/src/pages/settings/general.vue
index db7d5ddcf..172e07001 100644
--- a/packages/frontend/src/pages/settings/general.vue
+++ b/packages/frontend/src/pages/settings/general.vue
@@ -162,6 +162,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 		<div class="_gaps_m">
 			<div class="_gaps_s">
+				<MkSwitch v-model="warnMissingAltText">{{ i18n.ts.warnForMissingAltText }}</MkSwitch>
 				<MkSwitch v-model="imageNewTab">{{ i18n.ts.openImageInNewTab }}</MkSwitch>
 				<MkSwitch v-model="useReactionPickerForContextMenu">{{ i18n.ts.useReactionPickerForContextMenu }}</MkSwitch>
 				<MkSwitch v-model="enableInfiniteScroll">{{ i18n.ts.enableInfiniteScroll }}</MkSwitch>
@@ -299,6 +300,7 @@ const forceShowAds = computed(defaultStore.makeGetterSetter('forceShowAds'));
 const loadRawImages = computed(defaultStore.makeGetterSetter('loadRawImages'));
 const highlightSensitiveMedia = computed(defaultStore.makeGetterSetter('highlightSensitiveMedia'));
 const imageNewTab = computed(defaultStore.makeGetterSetter('imageNewTab'));
+const warnMissingAltText = computed(defaultStore.makeGetterSetter('warnMissingAltText'));
 const nsfw = computed(defaultStore.makeGetterSetter('nsfw'));
 const showFixedPostForm = computed(defaultStore.makeGetterSetter('showFixedPostForm'));
 const showFixedPostFormInChannel = computed(defaultStore.makeGetterSetter('showFixedPostFormInChannel'));
diff --git a/packages/frontend/src/pages/settings/preferences-backups.vue b/packages/frontend/src/pages/settings/preferences-backups.vue
index da6fb5f6b..58380c361 100644
--- a/packages/frontend/src/pages/settings/preferences-backups.vue
+++ b/packages/frontend/src/pages/settings/preferences-backups.vue
@@ -75,6 +75,7 @@ const defaultStoreSaveKeys: (keyof typeof defaultStore['state'])[] = [
 	'showRenotesCount',
 	'showReactionsCount',
 	'loadRawImages',
+	'warnMissingAltText',
 	'imageNewTab',
 	'dataSaver',
 	'disableShowingAnimatedImages',
diff --git a/packages/frontend/src/store.ts b/packages/frontend/src/store.ts
index 81b21dd5e..b44e1d9c4 100644
--- a/packages/frontend/src/store.ts
+++ b/packages/frontend/src/store.ts
@@ -247,6 +247,10 @@ export const defaultStore = markRaw(new Storage('base', {
 		where: 'device',
 		default: false,
 	},
+	warnMissingAltText: {
+		where: 'device',
+		default: true,
+	},
 	imageNewTab: {
 		where: 'device',
 		default: false,
diff --git a/packages/frontend/src/style.scss b/packages/frontend/src/style.scss
index 250a2616a..b021c0586 100644
--- a/packages/frontend/src/style.scss
+++ b/packages/frontend/src/style.scss
@@ -672,3 +672,12 @@ html[data-color-mode=dark] ._woodenFrame {
 	0% { filter: hue-rotate(0deg) contrast(150%) saturate(150%); }
 	100% { filter: hue-rotate(360deg) contrast(150%) saturate(150%); }
 }
+
+@keyframes mfm-fade {
+	0% {
+	  opacity: 0;
+	}
+	100% {
+	  opacity: 1;
+	}
+}