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My Web Site used to have a very simple filter that was not filtering class names. Now, many pages has different class names and there is too many pages to see them all one by one. I start to add rules to allow class names by pattern as I found new class but it because to be very annoying.
On my last attempt, I simply add multiple rules to allow every single class name but I'm afraid that will slow down the Web Site for nothing...
a*, b*, c*, ... y*, z*, A*, B*, C*, ... Y*, Z*
And even with all those rules, some class name are still striped...
According to W3C, there is a LOT more to consider than only a-z char on a class name:
[...] [class name] can contain only the characters [a-zA-Z0-9] and ISO 10646 characters U+00A1 and higher, plus the hyphen (-) and the underscore (_); they cannot start with a digit, or a hyphen followed by a digit. [...]
So, the class name 23 or -3r are not valid. However, the class name -r«3°C» IS valid (W3C rules, Firefox Browser and W3C Markup Validation Service accept it).
My request is to simply add a checkbox to allow the Bypass of the classname checking. I would be unchecked by default and has a description that explain Why it is so dangerous to bypass that check.