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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /custom-elements/parser/parser-custom-element-in-foreign-content.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>Custom Elements: Custom element in foreign content</title>
<meta name="assert" content="HTML parser should not create non-HTML namespace custom elements">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
class ThrowsException extends HTMLElement {
constructor() {
throw 'Bad';
}
};
customElements.define('throws-exception', ThrowsException);
</script>
<svg>
<throws-exception/>
</svg>
<script>
test(function () {
var instance = document.querySelector('throws-exception');
assert_false(instance instanceof ThrowsException,
'The HTML parser must NOT instantiate a custom element in non-HTML namespaces');
assert_false(instance instanceof HTMLUnknownElement, 'The HTML parser should not fallback');
assert_true(instance instanceof SVGElement,
'The element created by the HTML parser must be an instance of SVGElement');
}, 'HTML parser should not create custom elements in non-HTML namespaces');
</script>