diff --git a/src/Meta.ts b/src/Meta.ts
index b9d59246..6184683d 100644
--- a/src/Meta.ts
+++ b/src/Meta.ts
@@ -3,10 +3,25 @@ import type { Context } from './Context';
 
 import Builder from './Builder';
 
+import { validateEffects } from './utils';
+
 export default class Meta extends Builder {
   static elements = ['EMU-META'];
 
-  static async enter({ spec, node }: Context) {
+  static async enter({ spec, node, clauseStack }: Context) {
+    const parent = clauseStack[clauseStack.length - 1] || null;
+    if (node.hasAttribute('effects') && parent !== null) {
+      const effects = validateEffects(spec, node.getAttribute('effects')!.split(',').map(c => c.trim()), node);
+      for (const effect of effects) {
+        if (!parent.effects.includes(effect)) {
+          parent.effects.push(effect);
+          if (!spec._effectWorklist.has(effect)) {
+            spec._effectWorklist.set(effect, []);
+          }
+          spec._effectWorklist.get(effect)!.push(parent);
+        }
+      }
+    }
     spec._emuMetasToRender.add(node);
   }
 
diff --git a/test/baselines/generated-reference/effect-user-code.html b/test/baselines/generated-reference/effect-user-code.html
index 4a3c2242..23d5b626 100644
--- a/test/baselines/generated-reference/effect-user-code.html
+++ b/test/baselines/generated-reference/effect-user-code.html
@@ -4,7 +4,7 @@
 <emu-clause id="sec-user-code" type="abstract operation" aoid="UserCode">
   <h1><span class="secnum">1</span> UserCode ( )</h1>
   <p>The abstract operation UserCode takes no arguments. It performs the following steps when called:</p>
-  <emu-alg><ol><li>Call user code.</li></ol></emu-alg>
+  <emu-alg><ol><li><span class="e-user-code">Call user code</span>.</li></ol></emu-alg>
 </emu-clause>
 
 <emu-clause id="sec-nop" type="abstract operation" aoid="Nop">
diff --git a/test/baselines/sources/effect-user-code.html b/test/baselines/sources/effect-user-code.html
index 32123a12..7610d2d7 100644
--- a/test/baselines/sources/effect-user-code.html
+++ b/test/baselines/sources/effect-user-code.html
@@ -7,11 +7,9 @@
 <emu-clause id="sec-user-code" type="abstract operation">
   <h1>UserCode ( )</h1>
   <dl class="header">
-    <dt>effects</dt>
-    <dd>user-code</dd>
   </dl>
   <emu-alg>
-    1. Call user code.
+    1. <emu-meta effects="user-code">Call user code</emu-meta>.
   </emu-alg>
 </emu-clause>