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side-contracts have become a common way

to produce and consume information about types of content for which HTML doesn't yet include nouns. The most prominent of these are WAI-ARIA, Microformats, and Schema.org.

New Input attributes <input type="text" "new input attribute"/> Placeholder Autofocus Required

<input type="number"> elements do not support use of the pattern attribute for making entered values conform to a specific regex pattern.

inputs of type number support these attributes

for the sake of performance, it would make better sense to include the CSS first then this script

One element can also have multiple properties (multiple itemprop="" names separated by spaces) with the same value: <p itemscope><span itemprop="guitar vocals">Chris Askew</span>  is so dreamy.</p>

One element can also have multiple properties (multiple itemprop="" names separated by spaces) with the same value: <p itemscope><span itemprop="guitar vocals">Chris Askew</span>  is so dreamy.</p>

One element can also have multiple properties (multiple itemprop="" names separated by spaces) with the same value: <p itemscope><span itemprop="guitar vocals">Chris Askew</span>  is so dreamy.</p>

Once more, the iPhone recognises type="tel", only this time it goes one step further and completely changes the keyboard to the standard phone keyboard, as shown on the left in Figure 6. In addition to the iPhone, some Android devices (such as HTC Desire, shown on the right in Figure 6) also display a numeric keyboard for type="tel". That’s pretty handy, don’t you think? Nice, big keys for entering a phone number help you to get that big, nasty form completed quickly.

In contrast to Opera’s implementation, the iPhone (Figure 8) and some Android devices (such as HTC Desire, shown on the right in Figure 6-13) simply render the field as a standard text box but optimize the keyboard for easy input.

The solution for now is to produce your videos in multiple formats. Table 1. Browser support by video format Browser MP4 WebM Ogg Internet Explorer 9 Yes No No Firefox 4.0 No Yes Yes Google Chrome 6 Yes Yes Yes Apple Safari 5 Yes No No Opera 10.6 No Yes Yes Note: For the latest compatibility information, always check the CanIUse website.

A more robust way to create the fallback is to use a JavaScript utility like Modernizr to evaluate the browser's capabilities and then dynamically write the video and source tags or embed the Flash video player using SWFObject.

Tip 3: The source tag should always include the "type" attribute with the correct MIME type value. You may need to add an .htaccess file to your server to define the MIME types as well. Check out the Video for everybody article for more tips on MIME types.

a third option developed using lessons learned from microformats and RDFa, and designed to be integrated into HTML5 itself: microdata.

“Adding microdata” to your page is a matter of adding a few attributes to the HTML elements you already have.

So where is the real information? It’s in the <dd> element, so that’s where we need to put the itemprop attribute. Which property is it? It’s the name property. Where is the property value? It’s the text within the <dd> element. Does that need to be marked up? the HTML5 microdata data model says no, <dd> elements have no special processing, so the property value is just the text within the element.

The HTML5 microdata standard includes both HTML markup (primarily for search engines) and a set of DOM functions (primarily for browsers). There’s no harm in including microdata markup in your web pages. It’s nothing more than a few well-placed attributes, and search engines that don’t understand the microdata attributes will just ignore them. But if you need to access or manipulate microdata through the DOM, you’ll need to check whether the browser supports the microdata DOM API.