File: trusted-click.js

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// Invokes callback from a trusted click event, to satisfy
// https://html.spec.whatwg.org/#triggered-by-user-activation
function trusted_click(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 = function()
    {
        callback();
        container.removeChild(button);
    };
    container.appendChild(button);
}

// Invokes element.requestFullscreen() from a trusted click.
function trusted_request(element, container)
{
    var request = element.requestFullscreen.bind(element);
    trusted_click(request, container || element.parentNode);
}