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-rw-r--r-- | toolkit/content/tests/widgets/test_panel_list_shadow_node_anchor.html | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/toolkit/content/tests/widgets/test_panel_list_shadow_node_anchor.html b/toolkit/content/tests/widgets/test_panel_list_shadow_node_anchor.html new file mode 100644 index 0000000000..9f265d4cf9 --- /dev/null +++ b/toolkit/content/tests/widgets/test_panel_list_shadow_node_anchor.html @@ -0,0 +1,96 @@ +<!DOCTYPE HTML> +<html> +<head> + <meta charset="utf-8"> + <title>Bug 1802215 - Allow <panel-list> to be anchored to shadow DOM nodes</title> + <script src="/tests/SimpleTest/SimpleTest.js"></script> + <script src="./panel-list.js"></script> + <link rel="stylesheet" href="/tests/SimpleTest/test.css"/> + <link rel="stylesheet" href="./panel-list.css"/> + <link rel="stylesheet" href="./panel-item.css"/> + <script> + /** + * Define a simple custom element that includes a <button> in its + * shadow DOM to anchor a panel-list on. The TestElement is slotted, + * putting any direct descendents right after a 400px tall <div> + * with a red border. + */ + class TestElement extends HTMLElement { + static get fragment() { + const MARKUP = ` + <template> + <div style="height: 100px; border: 1px solid red;"> + <button id="anchor">Anchor</button> + </div> + <slot></slot> + </template> + `; + + let parser = new DOMParser(); + let doc = parser.parseFromString(MARKUP, "text/html"); + TestElement.template = document.importNode( + doc.querySelector("template"), + true + ); + let fragment = TestElement.template.content.cloneNode(true); + return fragment; + } + + connectedCallback() { + this.shadow = this.attachShadow({ mode: "closed" }); + this.shadow.appendChild(TestElement.fragment); + this.anchor = this.shadow.querySelector("#anchor"); + this.anchor.addEventListener("click", event => { + let panelList = this.querySelector("panel-list"); + panelList.toggle(event); + }); + } + + doClick() { + this.anchor.click(); + } + } + + customElements.define("test-element", TestElement); + + /** + * Tests that if a <panel-list> is anchored on a node within a custom + * element shadow DOM, that it anchors properly to that shadow node. + */ + add_task(async function test_panel_list_anchor_on_shadow_node() { + let testElement = document.getElementById("test-element"); + let panelList = document.getElementById("test-list"); + + let openPromise = new Promise(resolve => { + panelList.addEventListener("shown", resolve, { once: true }); + }); + testElement.doClick(); + await openPromise; + + let panelRect = panelList.getBoundingClientRect(); + let anchorRect = testElement.anchor.getBoundingClientRect(); + // Recalculate the <panel-list> rect top value relative to the top-left + // of the anchorRect. We expect the <panel-list> to be tightly anchored + // to the bottom of the <button>, so we expect this new value to be 0. + let panelTopLeftRelativeToAnchorTopLeft = panelRect.top - anchorRect.top - anchorRect.height; + is( + panelTopLeftRelativeToAnchorTopLeft, + 0, + "Panel should be tightly anchored to the bottom of the button shadow node." + ); + }); + </script> +</head> +<body> +<p id="display"></p> +<div id="content"> + <test-element id="test-element"> + <panel-list id="test-list"> + <panel-item>An item</panel-item> + <panel-item>Another item</panel-item> + </panel-list> + </test-element> +</div> +<pre id="test"></pre> +</body> +</html> |