Below is the content of this page prettified. The <pre>
element is prettified because it has class="prettyprint" and
because the sourced script loads a JavaScript library that styles source
code.
The line numbers to the left appear because the preceding comment
<?prettify lang=html linenums=true?> turns on
line-numbering and the
stylesheet
(see skin=sunburst in the <script src>)
specifies that every fifth line should be numbered.