Do supply alt's for your images
Quite a few people disable the automatic load of pictures in their browser.
Don't blame them, some images take a lifetime to load.
By defining an alternative text with the attribute alt in the tag <IMG> you can take care of imageless browsers.
Do use alt text for areas
Use the alt attribute to supply text for areas in an image map, thus providing an alternative for browsers that don't support images.
Do use NOFRAMES
Not all browsers support frames. Define an alternative with the tag <NOFRAMES>
Do use comments for JavaScript
If you use JavaScript, be sure to place the source between comments in such a way that browsers that don't support JavaScript won't show any garbage.
Don't be selective with browsers
You believe I'd change my browser just to visit your site? Wake up!
Saying Best viewed with my favorite browser only has the effect that you drive off people with other browsers. Test your site with the favorites. It should be readable with all the important browsers.
Do test Java applets with all browsers
Java is great, I really love it. But as soon as a page starts with Applet loading, I got this feeling it all ends up wrong. There are indeed far too many untested applets wrecking browsers and making sure a visitor will never come back again.
Do check your Java applets with all popular browsers before using them.
Do test with fewer screen colors
256 colors still are popular and even 16 colors are used.
Test your site with these color settings. Admitted, with 16 colors everything looks ugly. But be sure everything remains readable.
Do test with lowres
Test your pages with low resolution. If you don't use 640*480 yourself, just make your browser-window smaller to get the same effect.
Do validate
Validate your pages. This is the best way to find errors that won't show up in some browsers but might be the cause of trouble in other browsers.
Don't rely on plugins
You can create astonishing effects with plugins like Flash and Shockwave.
But don't rely on them.
Many websurfers don't bother to install plugins. They won't be able to see the great effects you implemented. So offer an alternative or even better: check for plugins.
Do check for browser version
If you want to use non-standard techniques (Netscape or Explorer- specific tags) do check the browser version on the client. And do provide an alternative for non compatible browsers.
Do warn for important cookies
Some pages rely on cookies. And some people disable cookies in their browsers.
In many circumstances you just can't skip cookies. If so - supply a warning. Thus giving the visitor an opportunity to enable cookies.
Do offer alternative views
You want to use the newest emerging technologies? Then consider supplying an alternative view for those that don't use the latest browsers.
GENERAL
Do close popup screens
Remove your litter.
If you want to use popup screens, be sure to close them when the visitor leaves.
Do stop sounds
If you wanna use sounds, be sure to stop them when the visitor leaves.
Don't try to mislead search engines
Trying to mislead search engines by repeating keywords will turn against you. Search engines recognize many of these attempts and will react on it by giving your site a lower ranking. Or by not placing it at all.
Don't try to misleadingly attract visitors
By adding keywords that are specific to adult sites (like 'XXX') you might get some traffic. But those visitors will leave quickly – unless you do have an adult site, ofcourse.
Do register your site
Register your site at searchengines and directories. This is still the most important way to attract traffic.
Do read the stats
Use the statistics of your site. It's a good opportunity to check for errors like the dreaded 404's. But statistics are also invaluable for marketing purposes. What are popular pages? Which countries do your visitors come from?
Don't count hits
Hits are meaningless. A page with 5 images produces 6 hits. And visited 3 times it produces 18 hits. If you want a counter on your page, be sure to count the sessions: real visitors.
Do put contact info on your pages
Give your visitors a way to get in touch with you. Their feedback is invaluable. Supply a e-mail address or a reply-form.
Do beware of robots
Search engines use robots that scan all your directories. Be sure to provide a robots.txt file to make clear which directories and files should not be indexed.
A concluding don't
Don't take my word for it
Don't take my - or any other persons - word for it.
There's no such thing as a constitution of webdesign.
You might benefit by considering these do's and don'ts. But actually they're a personal view. And you just might disagree.
But do give these 100 do's and don'ts a serious thought.
They might fit more often than you think
Source : http://www.spiderpro.com/pr/prstgm001.html
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