Citation :
Some Web browsers don't support frames. For this reason, if you do decide to use frames, you should at least provide an additional non-frames version of your Web site. Badly designed (i.e., most) sites with frames allow the documents inside a page's frames to change, while the URL for the page stays the same. Thus, documents inside frames are not properly bookmarkable, and search engines cannot properly index them. Bookmarking or indexing will either point to a page which contains the wrong (framed) documents, or point to a document without the surrounding frames to give it a context. Why waste all of these valuable visits to your site? Frames are dependent on screen size, so your page will sometimes look terrible on a differently sized screen. There is no reliable way for Web surfers to predict the behavior of a site which has frames. Clicking on something in frame A can cause frame B to update, or could cause frame C to update. Frames waste valuable screen space. Once a document is constrained inside a frame, it is practically impossible for most Web surfers to pop that document out to use the entire window. Frames are #1 in the Top Ten Mistakes in Web Design. Frames are #1 in The Top Fifteen Mistakes of First Time Web Design. There are many more reasons to avoid frames.
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