diff --git a/src/components/rich_content/rich_content.jsx b/src/components/rich_content/rich_content.jsx
index fc17a529f..cdaebe2ff 100644
--- a/src/components/rich_content/rich_content.jsx
+++ b/src/components/rich_content/rich_content.jsx
@@ -313,7 +313,134 @@ export default {
           const newChildren = Array.isArray(children)
             ? [...children].reverse().map(processItemReverse).reverse()
             : children
-          return <Tag {...getAttrs(opener)}>{newChildren}</Tag>
+          const attrs = getAttrs(opener)
+          const newAttrs = { ...attrs }
+          const fullAttrs = getAttrs(opener, () => true)
+          const classname = fullAttrs['class']
+          const isMFM = classname?.startsWith('mfm-')
+          if (isMFM) {
+            const mfmOperator = /^mfm-(\w+)$/.exec(classname)?.[1]
+            newAttrs['class'] = 'mfm'
+            newAttrs['data-mfm-operator'] = mfmOperator
+            switch(mfmOperator) {
+              case 'position': {
+                const x = fullAttrs['data-mfm-x'].replace(/\.+$/,'') || 0
+                const y = fullAttrs['data-mfm-y'].replace(/\.+$/,'') || 0
+                newAttrs.style = [
+                  'transform:',
+                  `translate(calc(${x} * (var(--emoji-size) / 2)), `,
+                  `calc(${y} * (var(--emoji-size) / 2)))`,
+                ].join(' ')
+                break
+              }
+              case 'scale': {
+                const x = fullAttrs['data-mfm-x'].replace(/\.+$/,'') || 1
+                const y = fullAttrs['data-mfm-y'].replace(/\.+$/,'') || 1
+                newAttrs.style = [
+                  'transform:',
+                  `scale(${x}, ${y})`,
+                ].join(' ')
+                break
+              }
+              case 'rotate': {
+                const deg = fullAttrs['data-mfm-deg'] || 0
+                newAttrs.style = [
+                  `transform: rotate(${deg}deg)`,
+                  'transform-origin: center',
+                ].join(';')
+                break
+              }
+              case 'bg': {
+                const color = fullAttrs['data-mfm-color'] || 0
+                newAttrs.style = [
+                  `background-color: #${color}`,
+                ].join(' ')
+                break
+              }
+              case 'fg': {
+                const color = fullAttrs['data-mfm-color'] || 0
+                newAttrs.style = [
+                  `color: #${color}`,
+                ].join(';')
+                break
+              }
+              case 'spin': {
+                const speed = fullAttrs['data-mfm-speed'] || '1s'
+                const delay = fullAttrs['data-mfm-delay'] || 0
+                const left = fullAttrs['data-mfm-left'] != null
+                const alternate = fullAttrs['data-mfm-alternate'] != null
+                const y = fullAttrs['data-mfm-y'] != null
+                const x = fullAttrs['data-mfm-x'] != null
+
+                const anim = [
+                  x ? 'mfm-spinX' : null,
+                  y ? 'mfm-spinY' : null,
+                  'mfm-spin'
+                ].filter(a => a)[0]
+
+                const direction = [
+                  alternate ? 'alternate' : null,
+                  left ? 'reverse' : null,
+                  'normal',
+                ].filter(a => a)[0]
+
+                newAttrs.style = [
+                  `animation-name: ${anim}`,
+                  `animation-duration: ${speed}`,
+                  'animation-iteration-count: infinite',
+                  `animation-delay: ${delay}`,
+                  `animation-direction: ${direction}`,
+                  'animation-fill-mode: none',
+                  'animation-timing-function: linear',
+                ].join(';')
+                break
+              }
+              case 'flip': {
+                newAttrs.style = 'transform: scaleX(-1)'
+                break
+              }
+              case 'border': {
+                const width = fullAttrs['data-mfm-width'] || '0'
+                const style = fullAttrs['data-mfm-style'] || 'solid'
+                const color = fullAttrs['data-mfm-color'] || 'transparent'
+                const radius = fullAttrs['data-mfm-radius'] || '0'
+                const noclip = fullAttrs['data-mfm-noclip'] || false
+
+                newAttrs.style = [
+                  `border: ${width} ${style} ${color}`,
+                  `border-radius: ${radius}`,
+                  `overflow: ${noclip ? 'visible' : 'clip'}`
+                ].join(';')
+                break
+              }
+              case 'tada':
+              case 'jelly':
+              case 'twitch':
+              case 'shake':
+              case 'jump':
+              case 'bounce': {
+                const speed = fullAttrs['data-mfm-speed'] || '1s'
+                const delay = fullAttrs['data-mfm-delay'] || 0
+
+                const rules = [
+                  `animation-name: mfm-${mfmOperator}`,
+                  `animation-duration: ${speed}`,
+                  'animation-iteration-count: infinite',
+                  `animation-delay: ${delay}`,
+                  'animation-direction: normal',
+                  'animation-fill-mode: none',
+                  'animation-timing-function: linear',
+                ].join(';')
+                newAttrs.style = rules
+                break
+              }
+              default:
+                console.log(mfmOperator, opener)
+                console.log(mfmOperator)
+                break
+            }
+          }
+          return <Tag {...newAttrs}>{newChildren}</Tag>
         } else {
           return <Tag />
         }
diff --git a/src/components/rich_content/rich_content.scss b/src/components/rich_content/rich_content.scss
index 33effc623..f048e529e 100644
--- a/src/components/rich_content/rich_content.scss
+++ b/src/components/rich_content/rich_content.scss
@@ -1,6 +1,17 @@
 .RichContent {
   font-family: var(--font);
 
+  .mfm {
+    display: inline-block;
+    font-size: calc(var(--emoji-size) / 2);
+
+    .emoji {
+      /* Misskey's emoji width knows no bounds */
+      /* stylelint-disable-next-line declaration-no-important */
+      max-width: unset !important;
+    }
+  }
+
   &.-faint {
     color: var(--text);
     /* stylelint-disable declaration-no-important */
@@ -106,3 +117,289 @@ a .RichContent {
   /* stylelint-disable-next-line declaration-no-important */
   color: var(--link) !important;
 }
+
+@keyframes mfm-spin {
+  0% {
+    transform: rotate(0deg);
+  }
+
+  100% {
+    transform: rotate(360deg);
+  }
+}
+
+@keyframes mfm-spinX {
+  0% {
+    transform: perspective(8em) rotateX(0);
+  }
+
+  100% {
+    transform: perspective(8em) rotateX(360deg);
+  }
+}
+
+@keyframes mfm-spinY {
+  0% {
+    transform: perspective(8em) rotateY(0);
+  }
+
+  100% {
+    transform: perspective(8em) rotateY(360deg);
+  }
+}
+
+@keyframes mfm-jump {
+    0% {
+        transform: translateY(0)
+    }
+
+    25% {
+        transform: translateY(-1em)
+    }
+
+    50% {
+        transform: translateY(0)
+    }
+
+    75% {
+        transform: translateY(-0.5em)
+    }
+
+    100% {
+        transform: translateY(0)
+    }
+}
+
+@keyframes mfm-bounce {
+    0% {
+        transform: translateY(0) scale(1)
+    }
+
+    25% {
+        transform: translateY(-16px) scale(1)
+    }
+
+    50% {
+        transform: translateY(0) scale(1)
+    }
+
+    75% {
+        transform: translateY(0) scale(1.5,.75)
+    }
+
+    100% {
+        transform: translateY(0) scale(1)
+    }
+}
+
+@keyframes mfm-twitch {
+    0% {
+        transform: translate(7px,-2px)
+    }
+
+    5% {
+        transform: translate(-3px,1px)
+    }
+
+    10% {
+        transform: translate(-7px,-1px)
+    }
+
+    15% {
+        transform: translateY(-1px)
+    }
+
+    20% {
+        transform: translate(-8px,6px)
+    }
+
+    25% {
+        transform: translate(-4px,-3px)
+    }
+
+    30% {
+        transform: translate(-4px,-6px)
+    }
+
+    35% {
+        transform: translate(-8px,-8px)
+    }
+
+    40% {
+        transform: translate(4px,6px)
+    }
+
+    45% {
+        transform: translate(-3px,1px)
+    }
+
+    50% {
+        transform: translate(2px,-10px)
+    }
+
+    55% {
+        transform: translate(-7px)
+    }
+
+    60% {
+        transform: translate(-2px,4px)
+    }
+
+    65% {
+        transform: translate(3px,-8px)
+    }
+
+    70% {
+        transform: translate(6px,7px)
+    }
+
+    75% {
+        transform: translate(-7px,-2px)
+    }
+
+    80% {
+        transform: translate(-7px,-8px)
+    }
+
+    85% {
+        transform: translate(9px,3px)
+    }
+
+    90% {
+        transform: translate(-3px,-2px)
+    }
+
+    95% {
+        transform: translate(-10px,2px)
+    }
+
+    100% {
+        transform: translate(-2px,-6px)
+    }
+}
+
+@keyframes mfm-shake {
+    0% {
+        transform: translate(-3px,-1px) rotate(-8deg)
+    }
+
+    5% {
+        transform: translateY(-1px) rotate(-10deg)
+    }
+
+    10% {
+        transform: translate(1px,-3px) rotate(0)
+    }
+
+    15% {
+        transform: translate(1px,1px) rotate(11deg)
+    }
+
+    20% {
+        transform: translate(-2px,1px) rotate(1deg)
+    }
+
+    25% {
+        transform: translate(-1px,-2px) rotate(-2deg)
+    }
+
+    30% {
+        transform: translate(-1px,2px) rotate(-3deg)
+    }
+
+    35% {
+        transform: translate(2px,1px)rotate(6deg)
+    }
+
+    40% {
+        transform: translate(-2px,-3px)rotate(-9deg)
+    }
+
+    45% {
+        transform: translateY(-1px)rotate(-12deg)
+    }
+
+    50% {
+        transform: translate(1px,2px)rotate(10deg)
+    }
+
+    55% {
+        transform: translateY(-3px)rotate(8deg)
+    }
+
+    60% {
+        transform: translate(1px,-1px)rotate(8deg)
+    }
+
+    65% {
+        transform: translateY(-1px)rotate(-7deg)
+    }
+
+    70% {
+        transform: translate(-1px,-3px)rotate(6deg)
+    }
+
+    75% {
+        transform: translateY(-2px)rotate(4deg)
+    }
+
+    80% {
+        transform: translate(-2px,-1px)rotate(3deg)
+    }
+
+    85% {
+        transform: translate(1px,-3px)rotate(-10deg)
+    }
+
+    90% {
+        transform: translate(1px)rotate(3deg)
+    }
+
+    95% {
+        transform: translate(-2px)rotate(-3deg)
+    }
+
+    100% {
+        transform: translate(2px,1px)rotate(2deg)
+    }
+}
+
+@keyframes mfm-rubberBand {
+    0% {
+        transform: scale(1)
+    }
+
+    30% {
+        transform: scale(1.25,.75)
+    }
+
+    40% {
+        transform: scale(.75,1.25)
+    }
+
+    50% {
+        transform: scale(1.15,.85)
+    }
+
+    65% {
+        transform: scale(.95,1.05)
+    }
+
+    75% {
+        transform: scale(1.05,.95)
+    }
+
+    100% {
+        transform: scale(1)
+    }
+}
+
+@keyframes mfm-rainbow {
+    0% {
+        filter: hue-rotate()contrast(150%)saturate(150%)
+    }
+
+    100% {
+        filter: hue-rotate(360deg)contrast(150%)saturate(150%)
+    }
+}