4. Html Validator adds a tiny icon to the status bar which instantly validates the code as the page loads. The addon is based on HTML Tidy. You can also see the detailed validation report: 5.

In Opera, the menu item is "Source." When the source page opens, you'll see the HTML code for the full page. Scan through it to locate code for specific features and objects on the page, as desired.

Select that option to view a window that displays the page's HTML source code. Press "Ctrl-F" and type "style." The window searches the code for that word.