Luckily, there are numerous free tools out there to check whether your HTML, CSS and even your RSS feeds are valid.With these handy helpers, you can ensure that your visitors are experiencing your content exactly as you intend them to.An essential tool in just about every designer’s arsenal of tools, Firebug has become so commonplace that it has even begun getting its own extensions (such as Site Point’s own Code Burner reference tool).HTML Validator: Based on Tidy and Open SP, HTML Validator gives you an easy icon notification of the validity of any page you are visiting.If you're unsure what a message means, click the "help" link next to the message for a fuller explanation.RSS Validator - Feed validation service, enter the url and it would evaluate validity of feed RSS v9x validator. It works with RSS 0.90, 0.91, 0.92, 0.93, 0.94, 1.0, 1.1, and 2.0. To use it, simply enter the address of your feed and click Validate.If the validator finds any problems in your feed, it will give you messages for each type of problem and highlight where the problem first occurs in your feed.
line 441, column 2: url must be a full URL: https://archive.org/download/Nigel Farage APersonal Message To Northern Ireland Voters./Nigel Farage, a personal message to Northern Ireland voters..mp3 (4 occurrences) [help] error Error: 403 Forbidden by This Link Checker looks for issues in links, anchors and referenced objects in a Web page, CSS style sheet, or recursively on a whole Web site.
Feed Validator - This is a validator for syndicated feeds.
It works with RSS 0.90, 0.91, 0.92, 0.93, 0.94, 1.0, and 2.0. If the validator finds any problems in your feed, it will give you messages for each type of problem and highlight where the problem first occurs in your feed.
W3C Validator - a free service that checks documents like HTML and XHTML for conformance to W3C Recommendations and other standards.
Redland RSS 1.0 Validator - Enter the address of an RSS 1.0 feed into the following form and it will be validated and formatted for display.