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function simulateGesture(t, callback) {
// Get or create the target element.
let target = document.getElementById('target');
if (!target) {
target = document.createElement('button');
target.setAttribute('id', 'target');
document.body.appendChild(target);
}
// Simulate a gesture in the top frame to remove any gesture based autoplay
// restrictions.
test_driver.click(target).then(callback, t.unreached_func('click failed'));
}
function isAutoplayAllowed() {
return new Promise((resolve, reject) => {
const video = document.createElement('video');
video.src = getVideoURI('/media/A4');
video.play().then(() => resolve(true), (e) => {
if (e.name == 'NotAllowedError')
resolve(false);
else
resolve(true);
});
});
}