Live Scripting HTML Parser

Markup to test (permalink, Live DOM Viewer)

<html> <head></head><body> <p> <script> document.write ('aaaaaaa</p><script>document.write("cccccc");</', 'script>bbbbbb'); </script> <p>

This is a simplified implementation of HTML5 Parsing Algorithm. It only implements script-related part of the algorithm. Especially, this parser:

Does not support DOCTYPE and comment tokens.
Does not support entities except for ", ', and & in script src attribute value.
Does not support omissions of start or end tags, the AAA algorithm, and so on.
Does not raise parse errors for invalid attribute specifications in start or end tags.
Does not support CDATA/PCDATA element other than script.
Does not support  parsing rule in script element.
Does not support foreign (SVG or MathML) elements.
Only supports script type text/javascript. type and language attributes are ignored.
Only supports document.write. The script code must be match to the regular expression ^\s*(?:document\.write\s*$v\s*(?:,\s*v\s*)*$\s*;\s*)*$ where v is "[^"]*"|'[^']*'.
Only supports javascript: URI scheme in the src attribute of the script element. In addition, the URI must be conform to the regular expression ^javascript:\s*(?:"[^"]*"|'[^']*')\s*$.

For some reason, this parser does not work in browsers that do not support JavaScript 1.5.