Initial work on UCS-2 DOMStrings.
Save progress.
Fix HTMLImageElement.
Fix more build errors.
Pass a slice to xml_name_type.
Push to a mutable string.
Fix borrowck errors and warnings in script.
Start on layout.
Fix some build errors.
More build fixes.
Also update matching.rs.
Remove a fail!().
Reduce cloning in HTML serialization.
Reimplement string escaping in htmlserializer.
Reimplement eq_ignore_ascii_case.
Reimplement IterBytes for LowercaseAsciiString.
Replace from_strings with a custom + operator.
Compress whitespace in document.title.
Add missing negation.