During progressive enhancement you use a lot of JS functionality at the top enhancement layer. But... some browsers do not support enough of JS. In order not to break your app - the usual browser response to the errors in JavaScript which makes the script stop working at that point - is to continue rendering HTML. This might look as an OK work but some parts of your JS or the whole thing might not working correct. This is why in real life watching the HTML page working is not enough for JS debugging.
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