The new canvas tag in HTML5  is known for its illustration power. It’s basically an empty element on which you can write and sketch using Javascript. But there’s a hidden power: image manipulation.

Most of the web pages you encounter is presented to you via HTML, the world wide web’s markup language. In this article, I will share with you 20 best practices that will lead to clean and correct markup.

HTML5 has a new attribute, contenteditable, which can be applied to any element which allows it to be edited directly in the browser window. Think of text input with a predefined value, but it can literally be any element. Form elements like text inputs support the :focus pseudo class, which allow us to style those elements when they are clicked upon or otherwise navigated to.

Today’s free helping from the Think Vitamin Membership video library looks at what to do and what not to do when designing HTML email.

There’s a lot of buzz going around about HTML5. Big companies such as Apple are predicting that it’s the technology that will sign the  death warrant of the popular Flash platform that powers a lot of rich internet apps and complex dynamic web components.

In this quick tip, we’ll review how to work with HTML 5 video in your own projects. Because older browsers and Internet Explorer do not understand the <video> element, we must also find a way to serve a Flash file to viewers who are utilizing those browsers.

Client-side optimization is getting a lot of attention lately, but some of its basic aspects seem to go unnoticed. If you look carefully at pages on the web (even those that are supposed to be highly optimized), it’s easy to spot a good amount of redundancies, and inefficient or archaic structures in their markup. All this baggage adds extra weight to pages that are supposed to be as light as possible.

The reason to keep documents clean is not so much about faster load times, as it is about having a solid and robust foundation to build upon. Clean markup means better accessibility, easier maintenance, and good search engine visibility. Smaller size is just a property of clean documents, and another reason to keep them this way.

The Web works with valid and invalid HTML. So why is valid HTML important? And how does invalid HTML affect everyone who uses the Web? Technical standards are the bedrock of innovation and it is a recognized fact that smaller companies often lead in the creation of innovative technologies. Standards create a level playing field on which these smaller companies compete with giants.

While they say a picture is worth a thousand words, not every image is self-explanatory. Sometimes a few words of description or context can make the difference between a confusing image and a clarifying one. That’s why image captions are often a good idea.

If you are the guy who uses <div> tag for everything, this post is for you. It focuses on how you can write clean HTML code by using semantic markups and minimize the use of <div> tag. Have you ever edited someone’s templates, don’t those messy tags drive you crazy? Not only writing clean templates can benefit yourself, but your team as well. It will save you time when you have to debug and edit (particularly the large projects).