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HTML Purifier is a standards-compliant HTML filter library written in PHP. HTML Purifier will not only remove all malicious code (better known as XSS) with a thoroughly audited, secure yet permissive whitelist, it will also make sure your documents are standards compliant, something only achievable with a comprehensive knowledge of W3C's specifications. Tired of using BBCode due to the current landscape of deficient or insecure HTML filters? Have a WYSIWYG editor but never been able to use it? Looking for high-quality, standards-compliant, open-source components for that application you're building? HTML Purifier is for you!

For many, designing and coding for emails can become a frustrating task. With so many different types of email clients that each seem to follow distinct standards, many hours can be spent just to figure out what works. Luckily, there are great resources available for reference.

These are my CSS test pages. In these pages you will find a growing collection of test and demonstrations of browser support of CSS standards.

This document is a section of the web browser standards support document. It includes detailed information about CSS support in major web browsers.

A chart displaying IE compatibility to CSS from version 5 to 8

With each new release of Windows Internet Explorer, support for the Cascading Style Sheets (CSS) standard has steadily improved. Internet Explorer 6 was the first fully CSS Level 1-compliant version of Internet Explorer. Windows Internet Explorer 8 is planned to be a fully CSS Level 2.1-compliant browser, and will support some features of CSS 3. If the browsers your Web site is targeting include earlier versions of Internet Explorer, however, you want to know the level of CSS compliance for those as well. This article provides an at-a-glance look at CSS compliance across recent versions of Internet Explorer, including support in Internet Explorer 8 Beta 1 for Developers and planned support in the final version of Internet Explorer 8.

Here is a LIVE demo showing how input buttons are rendered in your browser. The 'Standard' column will look different depending on your operating system. The '+ Border' column shows the same buttons with a red border added. (This removes the default button style as seen in the first column.)

...let's look a little deeper into the divide between the free thinking liberals, the traditionalist conservatives and the fascist Neocons. Name-calling, yes, unfair, no... by any definition held to a standard of actions over words.

This site is a free resource for the budding web designer looking to take the step into the future of modern web design. Throughout the guide, you will be shown cunning CSS techniques used to keep loadtime to a minimum and to organize and fine tune your content so it is presented in the best possible way

An attempt to standardize forms. Nice highlighting effects.

Plug and play style. Download the uni-form.zip (v1.2) and you're pretty much all set! It is encouraged to edit css properties only in the uni-form.css file, so you can easily upgrade to the newer versions as they come along by copying over the old copy the uni-form-generic.css.

swfIR (swf Image Replacement) is here to solve some of the design limitations of the standard HTML image and its widely-accepted associated CSS values, while still supporting standards-based design concepts.

CSS Design Yorkshire is a new collection of web sites created by designers in the Yorkshire region that conform with the W3C standards. Become part of a group of developers that make the web more accessible, better to look at and more fun!

Home of the Acid tests.

Google recently tested a new interface for search results. The test didn't include any new feature and Google even loaded the standard search results page to display the results. An important notable change is the new format was that Google didn't load a new page to display the results and browsers didn't send proper referrals when clicking on search results.

Some bright folks also feel the same pain and went ahead and built meta-languages and compilers that take their own version of CSS and compile it to standard CSS code. Their own CSS meta-language is thus able to have new features, like variables, mixins, operations and so on. The most notable of these right now is SASS (part of HAML). I've tried SASS and really liked it, but one thing really bothered me. I didn't like how all the syntax was different to CSS. Sure, it's not CSS anymore, it's SASS, but do we really need to change the syntax of the stuff already present in CSS - why not just expand it? I've asked a friend of mine who is much more competent at programming than me about how long it would take to code a CSS compiler that retained the original CSS syntax but added a bunch of new features. He liked the idea and so we've put together our own version of CSS together with a compiler we call LESS, which stands for Leaner CSS.

Styleneat organizes and standardizes your CSS in a structure that makes it easier to define page areas and see how they relate to each other.

This Guide is a reference to all of CSS 2.1, the W3C recommended standard for web page appearance, as of July 2008. We will also cover some aspects of CSS 3, currently a work in progress.