Bug 1978234 - Use simpler software downscale fallback. r=ahale
Differential Revision:
https://phabricator.services.mozilla.com/D257942
<!DOCTYPE html>
<html contenteditable="true">
<head>
<script>
function boom()
{
document.execCommand("inserthtml", false, "b");
var myrange = document.createRange();
myrange.selectNodeContents(document.getElementsByTagName("img")[0]);
window.getSelection().addRange(myrange);
document.execCommand("strikethrough", false, null);
}
</script>
</head>
<body onload="boom();"><img></body>
</html>
