element-web/src/usercontent/index.js

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const params = window.location.search.substring(1).split('&');
let lockOrigin;
for (let i = 0; i < params.length; ++i) {
const parts = params[i].split('=');
if (parts[0] === 'origin') lockOrigin = decodeURIComponent(parts[1]);
}
function remoteRender(event) {
const data = event.data;
const img = document.createElement("img");
img.id = "img";
img.src = data.imgSrc;
img.style = data.imgStyle;
const a = document.createElement("a");
a.id = "a";
a.rel = "noopener";
a.target = "_blank";
a.download = data.download;
a.style = data.style;
a.style.fontFamily = "Arial, Helvetica, Sans-Serif";
a.href = window.URL.createObjectURL(data.blob);
a.appendChild(img);
a.appendChild(document.createTextNode(data.textContent));
const body = document.body;
// Don't display scrollbars if the link takes more than one line to display.
body.style = "margin: 0px; overflow: hidden";
body.appendChild(a);
}
function remoteSetTint(event) {
const data = event.data;
const img = document.getElementById("img");
img.src = data.imgSrc;
img.style = data.imgStyle;
const a = document.getElementById("a");
a.style = data.style;
}
window.onmessage = function(e) {
if (lockOrigin === undefined || e.origin === lockOrigin) {
if (e.data.blob) remoteRender(e);
else remoteSetTint(e);
}
};