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// Asserts that the anchored element is at the top/bottom/left/right of the
// anchor.
function assert_fallback_position(anchored, anchor, direction) {
let anchoredRect = anchored.getBoundingClientRect();
let anchorRect = anchor.getBoundingClientRect();
let message = `Anchored element should be at the ${direction} of anchor`;
switch (direction) {
case 'top':
assert_equals(anchoredRect.bottom, anchorRect.top, message);
return;
case 'bottom':
assert_equals(anchoredRect.top, anchorRect.bottom, message);
return;
case 'left':
assert_equals(anchoredRect.right, anchorRect.left, message);
return;
case 'right':
assert_equals(anchoredRect.left, anchorRect.right, message);
return;
default:
assert_unreached('unsupported direction');
}
}
async function waitUntilNextAnimationFrame() {
return new Promise(resolve => requestAnimationFrame(resolve));
}
// This function is a thin wrapper around `checkLayout` (from
// resources/check-layout-th.js) and simply reads the `CHECK_LAYOUT_DELAY`
// variable to optionally add a delay. This global variable is not intended
// to be set by other tests; instead, polyfills can set it to give themselves
// time to apply changes before proceeding with assertions about the layout.
// Tests that call this function and then do additional work after the call
// should `await` it to avoid race conditions.
window.checkLayoutForAnchorPos = async function(selectorList, callDone = true) {
if (window.CHECK_LAYOUT_DELAY) {
assert_equals(window.INJECTED_SCRIPT,undefined,'CHECK_LAYOUT_DELAY is only allowed when serving WPT with --injected-script.');
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
}
return window.checkLayout(selectorList, callDone);
}