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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));
}
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