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 = '';

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='],
 };

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;
+	}
+}