Web browsers differences

Internet Explorer

• Debugging JavaScript on IE is a lot harder than on FF. The best is to install Firebug Lite. However, you must not use console.log() before the window is loaded (else you'll get a very annoying fatal error saying IE cannot open the page).

• Only use Prototype JS code or you'll run into troubles (mainly because all elements should be extended Prototype elements to ensure cross-browser behavior).

• IE 7 automatically adds margins to forms. You can override that behavior with CSS.

Opera

• location.hash is bugged when the hash contains a question mark.

• myForm.readAttribute("action") behaves differently in Opera, as it adds the hostname before (which is bad!). The bug was apparently fixed in Opera 9.50 (see this bug reference).

• Opera automatically adds margins to forms.