css/cssom-view/checkVisibility.html

<!DOCTYPE html>
<link rel=author href="mailto:jarhar@chromium.org">
<link rel=help href="https://github.com/w3c/csswg-drafts/issues/6850">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div id=visibilityhidden style="visibility:hidden">hello</div>

<div style="content-visibility:hidden">
  <div id=cvhidden>hello</div>
</div>

<div style="content-visibility:auto">
  <div id=cvauto>hello</div>
</div>

<div id=displaynone style="display:none">hello</div>

<div style="display:none" class="shadow-host-with-slot">
  <div id="slottedindisplaynone" slot="slot">slotted</div>
</div>

<div id=displaycontents style="display:contents">
  <div id=displaycontentschild>hello</div>
</div>

<div id=opacityzero style="opacity:0">hello</div>

<div style="opacity:0" class="shadow-host-with-slot">
  <div id="slottedinopacityzero" slot="slot">slotted</div>
</div>

<div style="content-visibility:hidden">
  <div id=cvhiddenchildwithupdate></div>
</div>

<div style="content-visibility:hidden" id=cvhiddenwithupdate></div>

<div style="content-visibility:hidden" class="shadow-host-with-slot">
  <div id="slottedincvhidden" slot="slot">slotted</div>
</div>

<div style="height:10000px">spacer</div>

<div style="content-visibility:auto">
  <div id=cvautooffscreen>hello</div>
</div>

<div id=cvautocontainer>
  <div id=cvautochild></div>
</div>

<div style="content-visibility:auto">
  <div style="content-visibility:auto">
    <div id=nestedcvautochild></div>
  </div>
</div>

<script>
for (const host of document.querySelectorAll(".shadow-host-with-slot")) {
  const shadowRoot = host.attachShadow({ mode: "open" });
  const slot = document.createElement("slot");
  slot.name = "slot";
  shadowRoot.appendChild(slot);
}

test(() => {
  assert_false(visibilityhidden.checkVisibility({
    checkVisibilityCSS: true
  }), 'checkVisibilityCSS:true');
  assert_false(visibilityhidden.checkVisibility({
    visibilityProperty: true
  }), 'visibilityProperty:true');
  assert_true(visibilityhidden.checkVisibility({
    checkVisibilityCSS: false
  }), 'checkVisibilityCSS:false');
}, 'checkVisibility on visibility:hidden element.');

test(() => {
  assert_false(cvhidden.checkVisibility());
}, 'checkVisibility on content-visibility:hidden element.');

test(() => {
  assert_false(slottedincvhidden.checkVisibility());
}, 'checkVisibility on element slotted in content-visibility: hidden shadow host.');

promise_test(async () => {
  await new Promise(r => requestAnimationFrame(() => requestAnimationFrame(r)));
  assert_true(cvauto.checkVisibility({
    contentVisibilityAuto: false
  }), 'contentVisibilityAuto: false');
  assert_true(cvauto.checkVisibility({
    contentVisibilityAuto: true
  }), 'contentVisibilityAuto: true');
}, 'checkVisibility on content-visibility:auto element.');

test(() => {
  assert_true(cvautooffscreen.checkVisibility({
    contentVisibilityAuto: false
  }), 'contentVisibilityAuto: false');
  assert_false(cvautooffscreen.checkVisibility({
    contentVisibilityAuto: true
  }), 'contentVisibilityAuto: true');
}, 'checkVisibility on content-visibility:auto element which is outside the viewport.');

test(() => {
  assert_false(displaynone.checkVisibility());
}, 'checkVisibility on display:none element.');

test(() => {
  assert_false(slottedindisplaynone.checkVisibility());
}, 'checkVisibility on element slotted in display:none shadow host.');

test(() => {
  assert_false(displaycontents.checkVisibility());
  assert_true(displaycontentschild.checkVisibility());
}, 'checkVisibility on display:contents element.');

test(() => {
  assert_false(opacityzero.checkVisibility({
    checkOpacity: true
  }), 'checkOpacity:true');
  assert_false(opacityzero.checkVisibility({
    opacityProperty: true
  }), 'opacityProperty:true');
  assert_true(opacityzero.checkVisibility({
    checkOpacity: false
  }), 'checkOpacity:false');
}, 'checkVisibility on opacity:0 element.');

test(() => {
  assert_false(slottedinopacityzero.checkVisibility({
    checkOpacity: true
  }), 'checkOpacity: true');
  assert_true(slottedinopacityzero.checkVisibility({
    checkOpacity: false
  }), 'checkOpacity: true');
}, 'checkVisibility on element slotted in opacity: 0; shadow host.');

test(() => {
  cvautocontainer.style.contentVisibility = 'auto';
  cvautochild.style.visibility = 'hidden';
  assert_false(cvautochild.checkVisibility({checkVisibilityCSS: true}));
  assert_false(cvautochild.checkVisibility({contentVisibilityAuto: true}));
  assert_true(cvautochild.checkVisibility());
  cvautochild.style.visibility = 'visible';
  assert_true(cvautochild.checkVisibility({checkVisibilityCSS: true}));
  assert_false(cvautochild.checkVisibility({contentVisibilityAuto: true}));
  assert_true(cvautochild.checkVisibility());
}, 'checkVisibility on content-visibility:auto with visibility:hidden inside.');

test(() => {
  assert_true(nestedcvautochild.checkVisibility());
}, 'checkVisibility on nested content-visibility:auto containers reports that the content is visible.');

test(() => {
  cvhiddenchildwithupdate.getBoundingClientRect();
  assert_false(cvhiddenchildwithupdate.checkVisibility());
}, 'checkVisibility on content-visibility:hidden child after forced layout update.');

test(() => {
  cvhiddenwithupdate.getBoundingClientRect();
  assert_true(cvhiddenwithupdate.checkVisibility());
}, 'checkVisibility on content-visibility:hidden element after forced layout update.');

test(() => {
  document.documentElement.style.contentVisibility = "hidden";
  assert_true(document.documentElement.checkVisibility());
  document.documentElement.style.removeProperty("content-visibility");
}, 'checkVisibility on root element with content-visibility: hidden returns true.');
</script>