Using the attributes, you can control the appearance of the frameset by removing the raised borders between the frames. You can control the scrolling and resizing for each individual frame, as well as the margins around each frame's HTML source. Typically the browser default for frameborders is yes, so if you want frameborders you do not need to use this attribute. You can control whether you want the user to be able to scroll the frame. Typically the browser default for scrolling is either yes or auto.
Different browsers have different margin defaults.
It confirms the appearance of your frames in the target browsers. Different browsers have different margin defaults. It confirms the appearance of your frames in the target browsers. Chances are that once you have your frames set up you will want to customize each frame's appearance. Cascading style sheets make it easy to manage the overall appearance of your whole frameset.