Asynchronous createHTML/createScript/createScriptURL #588
Description
Testcase:
<!DOCTYPE html>
<meta http-equiv="Content-Security-Policy" content="require-trusted-types-for 'script';">
<div id="div"></div>
<script>
trustedTypes.createPolicy("default", {
createHTML: async s => s,
});
div.innerHTML = "Hello World!"
</script>This sets the div's inner HTML to [object Promise] in all browsers, which at first was kinda unexpected to me.
Technically, an async function is equivalent to returning a Promise object, and it's unclear whether "stringifying" in "Process value with a default policy" is supposed to resolve that promise. So that's a special case of #541
cc @lukewarlow