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.

By viewing the page's HTML or source code, you can see how elements on the page are handled as well as paths to the page's images or audio features.

HTML comments will be viewable in the compiled JSP’s HTML source code, and both major browsers make viewing this source easy. JSP comments, on the other hand, are not placed in the HTML document ...

Look for a menu option that has the word "Source" in it, such as "View Page Source." Select that option to view a window that displays the page's HTML source code.