In a nutshell: this page lists HTML validators (which check HTML code for standards compliance and errors), CSS validators (which check Cascading Style Sheets for errors and standards compliance), browser compatibility checkers (checks your page to see if it is compatible with various browsers), broken link (or dead links) checkers, accessibility checking (check if your web page is accessible to people with disabilities), etc.Note that this page lists both free online services as well as free offline tools (programs).The most effective way to use this is to add the Many websites that used to publish their content in RSS format have stopped doing so and popular readers, including Google Reader, have been discontinued due to ever dwindling user numbers.

The tutorial takes you through all the steps needed to start your own site in an easy-to-understand manner. For more information about validation itself, see What is HTML and CSS Validation? There's nothing like using the very tools that are used by the blind to experience what they face when they arrive at your website.

Those puzzled by the terms "HTML" and "CSS" may want to read the article What is HTML, CSS, Java Script, PHP and Perl? My primer on accessibility, How to Improve the Accessibility of Your Website may be useful too.

You’ll build a simple Spring MVC application that take user input and checks the input using standard validation annotations.

You’ll also see how to display the error message on the screen so the user can re-enter a valid input. You can use any build system you like when building apps with Spring, but the code you need to work with Gradle and Maven is included here. Post Mapping; import org.servlet.config.annotation. View Controller Registry; import org.servlet.config.annotation. Web Mvc Configurer Adapter; @Controller public class Web Controller extends Web Mvc Configurer Adapter and are resolved as views by stripping the '.html' suffix off the file name.

In Firefox you'll see a link to the RSS in the URL box.

You can then subscribe directly to the What's New feed without visiting any other page.

Blog articles, press releases, updates, or other regularly updated content are all logical candidates for getting a RSS feed.

While not as popular as these feeds were a few years ago, there is still value in turning this regularly updated website content into an RSS feed and making it available to your site's visitors - and since it's also pretty easy to create and add this feed, there is really no reason not to do so on your website.

Validation is, however, neither a full quality check, nor is it strictly equivalent to In addition to this validator, the W3C is offering a number of other tools to help you check other types of documents (CSS, RDF, P3P, ...), find broken links in your Web pages, and so on.

RSS, which stands for Rich Site Summary (but is also often known as Really Simple Syndication), is a commonly used format for publishing a "feed" of content from a website.

The program is free, runs on a variety of systems including Windows, Mac OS X, Linux, etc. Note: the newest version, located at the above address, did not have any executables/binaries (programs that are ready-to-run) available at the time I wrote this entry, since the programmers were still testing it.