The HTML Source inspector shows the code that browsers use to display the document as a Web page. To show or hide the HTML Source inspector, choose Window > HTML Source.
Changes you make in the Document window are immediately reflected in the HTML Source inspector. When you enter HTML into the HTML Source inspector and then click outside the inspector, corresponding changes appear in the Document window. For more information, see HTML Source inspector.
For minor editing of HTML tags, you can use the Quick Tag Editor instead of showing the HTML Source inspector. To display the Quick Tag Editor, press Control+T (Windows) or Command+T (Macintosh), or choose Modify > Quick Tag Editor. For more information, see Editing an HTML tag in the Document window.