If you’re a Web coder, Safari 3 offers some really nice debugging features – if you know where to look for them. First, you need to turn on Safari’s Develop menu (hidden by default). To do this, choose Safari > Preferences, then in the Advanced tab check the Show Develop menu in menu bar option. You’ll see the new menu appear to the right of the Bookmarks menu in the menu bar.
The first option, Open Page With, lets you open the current page in any other installed browser – handy for cross-browser testing. The second, User Agent, tells Safari to masquerade as another browser when viewing websites. Safari still renders pages as Safari, but sends another user agent string to the Web server. This can be useful if you’re testing browser detection code, for example.
Call in the Inspector