trusted-click.js
// Invokes callback from a trusted click event, to satisfy
// https://html.spec.whatwg.org/#triggered-by-user-activation
function trusted_click(test, callback, container)
{
var document = container.ownerDocument;
var button = document.createElement("button");
button.textContent = "click to continue test";
button.style.display = "block";
button.style.fontSize = "20px";
button.style.padding = "10px";
button.onclick = test.step_func(function()
{
callback();
container.removeChild(button);
});
container.appendChild(button);
}
// Invokes element.requestFullscreen() from a trusted click.
function trusted_request(test, element, container)
{
trusted_click(test, () => element.requestFullscreen(), container || element.parentNode);
}