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Validators and Checkers
Validating your pages not only improves accessibility, it will make your pages load faster and with fewer errors.
Online tool to check your pages for HTML errors. Very nitpicky (but in this case that's a good thing!).
Tool for evaluating the accessibility of Web pages. Check one page at a time online, or download their free software and check your whole site at once.
W3C service for validating Cascading Style Sheets.
From the Pennsylvania Initiative on Assistive Technology, an online, easy-to-use tool for checking basic accessibility features.
Online tool from the Web Design Group . Similar to W3C's tool, but slightly more user-friendly. Can check entire site with one click.
Somewhat slow-loading, but very thorough service that checks HTML, spelling, file size, etc. Imagiware also offers an HTML Squisher and an HTML Formatter .
Another WDG service, similar to the above, but pickier.
WDG tool that checks your pages for broken links, which are endemic on many sites.
"See what the search engines see." Predicts how your page will be listed by search engines. Site also features a Web Page Backward Compatibility Checker and a Web Page Purifier .
Simple, small program that generates broken link reports for your Web site (or any Web site you point it at). PC-only.