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'use strict';
// This test supplements the web-platform-tests in:
//
// web-animations/interfaces/Animatable/animate-no-browsing-context.
html
//
// Specifically, it covers the case where we have a running animation
// targetting an element in a document without a browsing context.
//
// Currently the behavior in this case is not well-defined. For example,
// if we were to simply take an element from such a document, and do:
//
// const xdoc = xhr.responseXML;
// const
div = xdoc.getElementById(
'test');
//
div.
style.opacity =
'0';
// alert(getComputedStyle(
div).opacity);
//
// We
'd get '0
' in Firefox and Edge, but an empty string in Chrome.
//
// However, if instead of using the
style attribute, we set
style in a <
style>
// element in *either* the document we
're calling from *or* the XHR doc and
// do the same we get
'1' in Firefox and Edge, but an empty string in Chrome.
//
// That is, no browser appears to apply styles to elements in a document without
// a browsing context unless the styles are defined using the
style attribute,
// and even then Chrome does not.
//
// There is some prose in CSSOM which says,
//
// Note: This means that even if obj is in a different document (e.g. one
// fetched via XMLHttpRequest) it will still use the
style rules associated
// with the document that is associated with the global
object on which
// getComputedStyle() was invoked to compute the CSS declaration block.[1]
//
// However, this text has been around since at least 2013 and does not appear
// to be implemented.
//
// As a result, it
's not really possible to write a cross-browser test for the
// behavior for animations in this context since it
's not clear what the result
// should be. That said, we still want to exercise this particular
code path so
// we make this case a Mozilla-specific test. The other similar tests cases for
// which the behavior is well-defined are covered by web-platform-tests.
//
// [1]
https://drafts.csswg.org/cssom/#extensions-to-the-window-interface
function getXHRDoc(t) {
return new Promise(resolve => {
const xhr = new XMLHttpRequest();
xhr.open(
'GET',
'xhr_doc.html');
xhr.responseType =
'document';
xhr.onload = t.step_func(() => {
assert_equals(xhr.readyState, xhr.DONE,
'Request should complete successfully');
assert_equals(xhr.status, 200,
'Response should be OK');
resolve(xhr.responseXML);
});
xhr.send();
});
}
promise_test(t => {
let anim;
return getXHRDoc(t).then(xhrdoc => {
const
div = xhrdoc.getElementById(
'test');
anim =
div.animate({ opacity: [ 0, 1 ] }, 1000);
// Give the animation an active timeline and kick-start it.
anim.timeline = document.timeline;
anim.startTime = document.timeline.currentTime;
assert_equals(anim.playState,
'running',
'The animation should be running');
// Gecko currently skips applying animation styles to elements in documents
// without browsing contexts.
assert_not_equals(getComputedStyle(
div).opacity,
'0',
'Style should NOT be updated');
});
},
'Forcing an animation targetting an element in a document without a'
+
' browsing context to play does not cause style to update');
promise_test(t => {
let anim;
return getXHRDoc(t).then(xhrdoc => {
const
div = addDiv(t);
anim =
div.animate({ opacity: [ 0, 1 ] }, 1000);
assert_equals(getComputedStyle(
div).opacity,
'0',
'Style should be updated');
// Trigger an animation restyle to be queued
anim.currentTime = 0.1;
// Adopt node into XHR doc
xhrdoc.
body.appendChild(
div);
// We should skip applying animation styles to elements in documents
// without a pres shell.
assert_equals(getComputedStyle(
div).opacity,
'1',
'Style should NOT be updated');
});
},
'Moving an element with a pending animation restyle to a document without'
+
' a browsing context resets animation style');
</
script>
