Can you provide examples of parsing HTML?

Question

How do you parse HTML with a variety of languages and parsing libraries?

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When answering:

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Answer 1

language: Python
library: lxml.html

import lxml.html

html = ""
for link in ("foo", "bar", "baz"):
    html += '%s' % (link, link)
html += ""

tree = lxml.html.document_fromstring(html)
for element, attribute, link, pos in tree.iterlinks():
    if attribute == "href":
        print link

lxml also has a CSS selector class for traversing the DOM, which can make using it very similar to using JQuery:

for a in tree.cssselect('a[href]'):
    print a.get('href')