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// This function is a version of test_driver.bless which works while there are
// elements in the top layer:
// https://github.com/web-platform-tests/wpt/issues/41218.
// Pass it the element at the top of the top layer stack.
window.blessTopLayer = async (topLayerElement) => {
const button = document.createElement('button');
topLayerElement.append(button);
let wait_click = new Promise(resolve => button.addEventListener("click", resolve, {once: true}));
await test_driver.click(button);
await wait_click;
button.remove();
};
window.isTopLayer = (el) => {
// A bit of a hack. Just test a few properties of the ::backdrop pseudo
// element that change when in the top layer.
const properties = ['right','background'];
const testEl = document.createElement('div');
document.body.appendChild(testEl);
const computedStyle = getComputedStyle(testEl, '::backdrop');
const nonTopLayerValues = properties.map(p => computedStyle[p]);
testEl.remove();
for(let i=0;i<properties.length;++i) {
if (getComputedStyle(el,'::backdrop')[properties[i]] !== nonTopLayerValues[i]) {
return true;
}
}
return false;
};
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