HTML5 and CSS3: level up with today's web technologies by Brian P. Hogan

By Brian P. Hogan

HTML5 and CSS3 energy today’s internet purposes, with semantic markup, larger kinds, local multimedia, animations, and strong APIs. You’ll get hands-on with the entire new beneficial properties with useful instance initiatives, and locate what you wish quick with this book’s modular constitution. “Falling again” sections assist you create strategies for older browsers, and “The destiny” sections on the finish of every bankruptcy get you desirous about the probabilities while positive aspects mature.

This revised moment version walks you thru new gains resembling IndexedDB, CSS Animations, SVG, and extra, besides up-to-date fallback recommendations. You’ll use HTML5’s new markup to create higher constitution on your content material and higher interfaces in your kinds. You’ll paintings with new shape controls and validations, and construct interfaces which are obtainable to assistive expertise and cellular units. You’ll draw with the Canvas and SVG, do uncomplicated animations with natural CSS, paintings with complicated CSS selectors, and make audio and video play natively.

You’ll convey your internet apps to the subsequent point as you utilize net garage and IndexedDB to avoid wasting facts at the buyer and make functions on hand offline. And you’ll notice how you can use net sockets, geolocation, cross-document messaging, and the historical past API to create much more interactive applications.

Today, you have got the flexibleness that was merely on hand via huge JavaScript libraries or proprietary plugins. prepare for today’s net.

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Figure 3—A meter to show progress toward our goal Let’s build a quick prototype by creating a new HTML5 document. 00 as our current value to demonstrate how it works right now.

report erratum • discuss Showing Progress toward a Goal with the Element • 27 We can control the width of the meter using CSS as follows. css"> When we look at this in the browser, we see a very nice meter. But meters aren’t supported everywhere, so we need a good fallback solution. Falling Back Not every browser recognizes the tag.

The element we clicked on is represented by the keyword this within the click-handler function. Using getAttribute(), we retrieve the attributes we need from the elements to construct our pop-up window. That’s all there is to it! The link now opens in a new window. Falling Back These attributes work in older browsers right now as long as they support JavaScript. The custom data attributes won’t trip up the browser, and your document will be valid. Since you’re using the HTML5 doctype, the attributes that start with data- will all be ignored.

3 It doesn’t add the missing functionality, but it does provide several mechanisms similar to the solution we implemented for detecting things that are more bulletproof than solutions we might roll ourselves. We load Modernizr in the of our document after our CSS references. Modernizr makes a Modernizr object available to us, which we can use to detect features and load fallbacks. color){ // we have color support }else{ // we don't have color support. } However, we need to load additional libraries when we don’t have support.

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