The SyntaxError thrown when evaluating problematic on* handlers doesn't really make sense and is not helpful.

Consider:

    <input onclick="foo("bar")")">

Because of the improperly nested quotes, this parses as something like:

    <input onclick="foo(" bar")")"="">

which can be simplified to:

    <input onclick="foo(">

But the error thrown when clicking is:

    Uncaught SyntaxError: Unexpected token }

Since no } actually appears in the (html) source, this is misleading and causes confusion[1].

Might be related to issue 70895.


1. Example: https://stackoverflow.com/questions/37820123/uncaught-syntaxerror-unexpected-token-when-trying-pass-data-to-jquery-variabl/37820293