Spinoff from bug 230360 Some of the errors that can happen during parsing end up getting propagated too far. And some of them should not even be errors in the first place. One example is NS_ERROR_HTMLPARSER_BLOCK that doesn't indicate that anything has actually gone wrong, just that the parser needs to be blocked. Another example is that during CloseElement we will get an error from <link> elements if the stylesheet can't be loaded. However the reason could be as simple as stylesheets being turned off since we're loading a datadocument. A good place to search is the codepaths called during CreateElement and CloseElement. See also bug 230360 comment 6 to 8
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