I found the term here: https://developer.mozilla.org/en/Mozilla_Web_Developer_FAQI know what a XML parser is.I can't understand; what exactly is an expat XML parser?
What's an expat XML parser?
html;web;xml
Expat is a specific XML parser. Mozilla's ordinary HTML parser just tries to make the best of what it's given, while a real XML parser is much less lenient, as described on that page.