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// Force releasing decoder to avoid timeout in waiting for decoding resource.
function removeNodeAndSource(n) {
n.remove();
// reset |srcObject| first since it takes precedence over |src|.
n.srcObject = null;
n.removeAttribute("src");
n.load();
while (n.firstChild) {
n.firstChild.remove();
}
}
function once(target, name, cb) {
var p = new Promise(function (resolve) {
target.addEventListener(
name,
function () {
resolve();
},
{ once: true }
);
});
if (cb) {
p.then(cb);
}
return p;
}