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<!DOCTYPE html>
<meta charset="utf-8" />
<title>Canvas descendants focusability</title>
<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
<link rel="help" href="https://html.spec.whatwg.org/multipage/canvas.html#being-used-as-relevant-canvas-fallback-content">
<link rel="help" href="https://html.spec.whatwg.org/multipage/interaction.html#focusable-area">
<meta name="assert" content="Checks that descendants of a canvas that represents
fallback content are not focusable if not rendered, as usual.">
<div id="log"></div>
<!-- Use a sandboxed iframe to disable scripting and make the canvas
represent its fallback content instead of embedded content. -->
<iframe sandbox="allow-same-origin" allow="focus-without-user-activation *"
srcdoc='
<button data-focusable="true" a></button>
<canvas>
<button data-focusable="true"></button>
<section tabindex="-1" data-focusable="true">
<div tabindex="-1" data-focusable="true"></div>
<span tabindex="-1" data-focusable="true"></span>
<a href="#" data-focusable="true"></a>
</section>
<button hidden data-focusable="false"></button>
<section tabindex="-1" hidden data-focusable="false">
<div tabindex="-1" data-focusable="false"></div>
<span tabindex="-1" data-focusable="false"></span>
<a href="#" data-focusable="false"></a>
</section>
</canvas>
'></iframe>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
setup({ explicit_done: true });
setup(async () => {
const iframe = document.querySelector("iframe");
await new Promise(resolve => {
const win = iframe.contentWindow;
if (win.location.href === "about:blank" ||
win.document.readyState !== "complete") {
iframe.addEventListener("load", resolve, {once: true});
} else {
resolve();
}
});
const doc = iframe.contentDocument;
for (let element of doc.querySelectorAll("[data-focusable]")) {
let title = element.cloneNode(false).outerHTML.toLowerCase();
title = title.slice(0, title.lastIndexOf("<"));
test(function() {
assert_true(doc.activeElement !== element, "Not initially focused");
element.focus();
if (JSON.parse(element.dataset.focusable)) {
assert_true(doc.activeElement === element, "Should be focused");
} else {
assert_true(doc.activeElement !== element, "Shouldn't be focused");
}
}, title);
}
done();
});
</script>
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