HTML: test upgrade custom element failure due to disabledFeatures
Specification PR: https://github.com/whatwg/html/pull/4673.
diff --git a/custom-elements/upgrading.html b/custom-elements/upgrading.html
index aaea0cb..d6b8ed3 100644
--- a/custom-elements/upgrading.html
+++ b/custom-elements/upgrading.html
@@ -14,6 +14,7 @@
<body>
<div id="log"></div>
<script>
+setup({allow_uncaught_exception:true});
class PredefinedCustomElement extends HTMLElement {}
customElements.define('predefined-custom-element', PredefinedCustomElement);
@@ -185,6 +186,23 @@
});
+test(() => {
+ class ShadowDisabledElement extends HTMLElement {
+ static get disabledFeatures() { return ['shadow']; }
+ }
+ let error = null;
+ window.addEventListener('error', e => { error = e.error; }, {once: true});
+ let element = document.createElement('shadow-disabled');
+ element.attachShadow({mode: 'open'});
+ customElements.define('shadow-disabled', ShadowDisabledElement);
+ customElements.upgrade(element);
+ assert_false(element instanceof ShadowDisabledElement,
+ 'Upgrading should fail.');
+ assert_true(error instanceof DOMException);
+ assert_equals(error.name, 'NotSupportedError');
+}, 'If definition\'s disable shadow is true and element\'s shadow root is ' +
+ 'non-null, then throw a "NotSupportedError" DOMException.');
+
</script>
</body>
</html>
