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CSS: :focus selector effects on shadow hosts #17493

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merged 6 commits into from
Sep 24, 2019
Merged

CSS: :focus selector effects on shadow hosts #17493

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2e153c5
CSS: :focus selector effects on shadow host with delegatesFocus
rakina Jun 25, 2019
bf72444
Move to shadow-dom, factor out stuff
rakina Jun 27, 2019
b87fd44
Update last test to not apply :focus to host
rakina Jun 26, 2019
d21e77b
Move to shadow-dom, factor out stuff
rakina Jun 27, 2019
bfdf9b8
Update tests so delegatesFocus=false also matches :focus
rakina Sep 20, 2019
42557ba
remove resetFocusOnRoot
rakina Sep 24, 2019
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72 changes: 72 additions & 0 deletions shadow-dom/focus/focus-selector-delegatesFocus.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,72 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>CSS Test (Selectors): :focus behavior with shadow hosts & delegatesFocus </title>
<link rel="author" title="Rakina Zata Amni" href="[email protected]" />
<link rel="help" href="https://html.spec.whatwg.org/multipage/semantics-other.html#selector-focus" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="resources/shadow-utils.js"></script>
</head>

<body>
<script>
function createFocusableDiv() {
const div = document.createElement("div");
div.innerText = "foo";
div.tabIndex = 0;
return div;
}

function createShadowHost(delegatesFocus, container) {
const host = document.createElement("div");
host.attachShadow({ mode: "open", delegatesFocus: delegatesFocus });
container.appendChild(host);
return host;
}

const delegatesFocusValues = [true, false];

for (const delegatesFocus of delegatesFocusValues) {
test(() => {
resetFocus();
const host = createShadowHost(delegatesFocus, document.body);
const shadowChild = createFocusableDiv();
host.shadowRoot.appendChild(shadowChild);

shadowChild.focus();
assert_true(shadowChild.matches(":focus"), "element in shadow tree matches :focus");
assert_true(host.matches(":focus"), "host matches :focus");
}, `:focus applies to host with delegatesFocus=${delegatesFocus} when the shadow root's descendant has focus`);

test(() => {
resetFocus();
const host = createShadowHost(delegatesFocus, document.body);
const slotted = createFocusableDiv();
host.shadowRoot.appendChild(document.createElement("slot"));
host.appendChild(slotted);

slotted.focus();
assert_true(slotted.matches(":focus"), "slotted element matches :focus");
assert_true(host.matches(":focus"), "host matches :focus");
}, `:focus applies to host with delegatesFocus=${delegatesFocus} when slotted element has focus`);
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This is wrong. If a slotted element has a focus, then the shadow host is its parent (or ancestor). If :focus shouldn't match both the slotted element and the host of the shadow tree to which it was assigned.

I'm fixing this in #19530


for (const nestedDelegatesFocus of delegatesFocusValues) {
test(() => {
resetFocus();
const host = createShadowHost(delegatesFocus, document.body);
const nestedHost = createShadowHost(nestedDelegatesFocus, host.shadowRoot);
const nestedShadowChild = createFocusableDiv();
nestedHost.shadowRoot.appendChild(nestedShadowChild);
nestedShadowChild.focus();
assert_true(nestedShadowChild.matches(":focus"), "element in nested shadow tree matches :focus");
assert_true(nestedHost.matches(":focus"), "host of nested shadow tree matches focus");
assert_true(host.matches(":focus"), "topmost host matches focus");
}, `:focus applies to host with delegatesFocus=${delegatesFocus} when an element in a nested shadow tree with delegatesFocus=${nestedDelegatesFocus} is focused`);
}
}
</script>
</body>
5 changes: 3 additions & 2 deletions shadow-dom/focus/resources/shadow-utils.js
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Original file line number Diff line number Diff line change
Expand Up @@ -60,8 +60,9 @@ function removeTabIndex(elements) {
}
}

function resetFocus() {
document.body.focus();
function resetFocus(root = document) {
if (root.activeElement)
root.activeElement.blur();
}

function navigateFocusForward() {
Expand Down