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With HTML5, is there any way in IE11/Edge to populate a sandboxed iframe (<iframe sandbox></iframe>) with HTML other than using a src url? I am looking for a solution like srcdoc which works with all other modern browsers.

Using src with a data URI is not an option according to Microsoft as it "cannot be used [to] populate frame or iframe elements." Surprisingly, this does works for me in Edge but only for data URIs with less than 4096 characters.

All other options that I have found, e.g. in Alternatives to iframe srcdoc? and Html code as IFRAME source rather than a URL do not work for a sandboxed iframe.

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Assuming usage of <iframe sandbox="allow-scripts"> is desired or acceptable, a possible workaround would be using window.postMessage() with the following setup:

index.html:

<!doctype html> <html> <body> <iframe onload="connectIframe()" sandbox="allow-scripts" src="iframeConnect.html" name="srcdocloader"></iframe> <script> var SRCDOC_HTML = '<html><body><script src="https://code.jquery.com/jquery-3.2.1.js"><\/script><script>console.log("loaded srcdoc and dependencies", jQuery);<\/script><h1>done!</h1></body></html>'; var loaded; function connectIframe (event) { if (!loaded) { loaded = true; window.frames.srcdocloader.postMessage(SRCDOC_HTML, '*'); } else { onloadSrcdoc(); } } function onloadSrcdoc () { // ... } </script> </body> </html>

iframeConnect.html:

<!doctype html> <script> window.addEventListener("message", handler); function handler(event) { if (event.source === window.parent) { window.removeEventListener("message", handler); document.write(event.data); document.close(); } } </script>

Note that the iframe's onload event will be triggered two times. The second time will be after the srcdoc html and all its dependencies got loaded.

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