diff --git a/.changeset/wise-maps-pump.md b/.changeset/wise-maps-pump.md
new file mode 100644
index 000000000..91c05719e
--- /dev/null
+++ b/.changeset/wise-maps-pump.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/parser': patch
+---
+
+fixed an issue using namespaced attributes in astro files
diff --git a/packages/astro-parser/src/parse/state/tag.ts b/packages/astro-parser/src/parse/state/tag.ts
index 70fa9e361..8f0b29a71 100644
--- a/packages/astro-parser/src/parse/state/tag.ts
+++ b/packages/astro-parser/src/parse/state/tag.ts
@@ -5,7 +5,7 @@ import read_style from '../read/style.js';
 import { decode_character_references, closing_tag_omitted } from '../utils/html.js';
 import { is_void } from '../../utils/names.js';
 import { Parser } from '../index.js';
-import { Directive, DirectiveType, TemplateNode, Text } from '../../interfaces.js';
+import { TemplateNode, Text } from '../../interfaces.js';
 import fuzzymatch from '../../utils/fuzzymatch.js';
 import list from '../../utils/list.js';
 import { FEATURE_CUSTOM_ELEMENT } from '../utils/features.js';
@@ -403,9 +403,6 @@ function read_attribute(parser: Parser, unique_names: Set<string>) {
 
   parser.allow_whitespace();
 
-  const colon_index = name.indexOf(':');
-  const type = colon_index !== -1 && get_directive_type(name.slice(0, colon_index));
-
   let value: any[] | true = true;
   if (parser.eat('=')) {
     parser.allow_whitespace();
@@ -421,74 +418,6 @@ function read_attribute(parser: Parser, unique_names: Set<string>) {
     );
   }
 
-  if (type) {
-    const [directive_name, ...modifiers] = name.slice(colon_index + 1).split('|');
-
-    if (type === 'Binding' && directive_name !== 'this') {
-      check_unique(directive_name);
-    } else if (type !== 'EventHandler' && type !== 'Action') {
-      check_unique(name);
-    }
-
-    if (type === 'Ref') {
-      parser.error(
-        {
-          code: 'invalid-ref-directive',
-          message: `The ref directive is no longer supported — use \`bind:this={${directive_name}}\` instead`,
-        },
-        start
-      );
-    }
-
-    if (type === 'Class' && directive_name === '') {
-      parser.error(
-        {
-          code: 'invalid-class-directive',
-          message: 'Class binding name cannot be empty',
-        },
-        start + colon_index + 1
-      );
-    }
-
-    if (value[0]) {
-      if ((value as any[]).length > 1 || value[0].type === 'Text') {
-        parser.error(
-          {
-            code: 'invalid-directive-value',
-            message: 'Directive value must be a JavaScript expression enclosed in curly braces',
-          },
-          value[0].start
-        );
-      }
-    }
-
-    const directive: Directive = {
-      start,
-      end,
-      type,
-      name: directive_name,
-      modifiers,
-      expression: (value[0] && value[0].expression) || null,
-    };
-
-    if (type === 'Transition') {
-      const direction = name.slice(0, colon_index);
-      directive.intro = direction === 'in' || direction === 'transition';
-      directive.outro = direction === 'out' || direction === 'transition';
-    }
-
-    if (!directive.expression && (type === 'Binding' || type === 'Class')) {
-      directive.expression = {
-        start: directive.start + colon_index + 1,
-        end: directive.end,
-        type: 'Identifier',
-        name: directive.name,
-      } as any;
-    }
-
-    return directive;
-  }
-
   check_unique(name);
 
   return {
@@ -500,17 +429,6 @@ function read_attribute(parser: Parser, unique_names: Set<string>) {
   };
 }
 
-function get_directive_type(name: string): DirectiveType {
-  if (name === 'use') return 'Action';
-  if (name === 'animate') return 'Animation';
-  if (name === 'bind') return 'Binding';
-  if (name === 'class') return 'Class';
-  if (name === 'on') return 'EventHandler';
-  if (name === 'let') return 'Let';
-  if (name === 'ref') return 'Ref';
-  if (name === 'in' || name === 'out' || name === 'transition') return 'Transition';
-}
-
 function read_attribute_value(parser: Parser) {
   const quote_mark = parser.eat("'") ? "'" : parser.eat('"') ? '"' : null;
 
diff --git a/packages/astro/test/astro-attrs.test.js b/packages/astro/test/astro-attrs.test.js
index 26371aeab..94f85b1d6 100644
--- a/packages/astro/test/astro-attrs.test.js
+++ b/packages/astro/test/astro-attrs.test.js
@@ -36,4 +36,21 @@ Attributes('Passes boolean attributes to components as expected', async ({ runti
   assert.equal($('#false').attr('type'), 'boolean');
 });
 
+Attributes('Passes namespaced attributes as expected', async ({ runtime }) => {
+  const result = await runtime.load('/namespaced');
+  assert.ok(!result.error, `build error: ${result.error}`);
+
+  const $ = doc(result.contents);
+  assert.equal($('div').attr('xmlns:happy'), 'https://example.com/schemas/happy');
+  assert.equal($('img').attr('happy:smile'), 'sweet');
+});
+
+Attributes('Passes namespaced attributes to components as expected', async ({ runtime }) => {
+  const result = await runtime.load('/namespaced-component');
+  assert.ok(!result.error, `build error: ${result.error}`);
+
+  const $ = doc(result.contents);
+  assert.equal($('span').attr('on:click'), Function.prototype.toString.call((event) => console.log(event)));
+});
+
 Attributes.run();
diff --git a/packages/astro/test/fixtures/astro-attrs/src/components/NamespacedSpan.astro b/packages/astro/test/fixtures/astro-attrs/src/components/NamespacedSpan.astro
new file mode 100644
index 000000000..bfadf035c
--- /dev/null
+++ b/packages/astro/test/fixtures/astro-attrs/src/components/NamespacedSpan.astro
@@ -0,0 +1 @@
+<span {...Astro.props} />
diff --git a/packages/astro/test/fixtures/astro-attrs/src/pages/component.astro b/packages/astro/test/fixtures/astro-attrs/src/pages/component.astro
index b0fa6490f..a6cc39d2c 100644
--- a/packages/astro/test/fixtures/astro-attrs/src/pages/component.astro
+++ b/packages/astro/test/fixtures/astro-attrs/src/pages/component.astro
@@ -3,4 +3,4 @@ import Span from '../components/Span.jsx';
 ---
 
 <Span id="true" attr={true} />
-<Span id="false" attr={false} />
\ No newline at end of file
+<Span id="false" attr={false} />
diff --git a/packages/astro/test/fixtures/astro-attrs/src/pages/namespaced-component.astro b/packages/astro/test/fixtures/astro-attrs/src/pages/namespaced-component.astro
new file mode 100644
index 000000000..5ac53e706
--- /dev/null
+++ b/packages/astro/test/fixtures/astro-attrs/src/pages/namespaced-component.astro
@@ -0,0 +1,4 @@
+---
+import NamespacedSpan from '../components/NamespacedSpan.astro'
+---
+<NamespacedSpan on:click={event => console.log(event)} />
diff --git a/packages/astro/test/fixtures/astro-attrs/src/pages/namespaced.astro b/packages/astro/test/fixtures/astro-attrs/src/pages/namespaced.astro
new file mode 100644
index 000000000..4ccbaed03
--- /dev/null
+++ b/packages/astro/test/fixtures/astro-attrs/src/pages/namespaced.astro
@@ -0,0 +1,3 @@
+<div xmlns:happy="https://example.com/schemas/happy">
+	<img src="jolly.avif" happy:smile="sweet"/>
+</div>