Detailed explanation of 28 very important new features, new techniques and new technologies of H5

HTML5 has a lot of new features. New code. Very good. Now summarize it. For reference only1. New Doctype
Although use , even if the browser does not If you understand this sentence, you will render it according to the standard mode
2. Figure element
Use

and

to semantically represent pictures with captions
< ;figure>

This is an image of something interesting. < ;/p>

3. Redefined
has been redefined , is now used to represent small layouts, such as the copyright statement at the bottom of the website
4. Remove the type attribute in the link and script tags
5. Add/without brackets
HTML5 There is no strict requirement that attributes must be quoted or closed, but it is recommended to add quotes and closing tags
6. To make your content editable, just add a contenteditable attribute
7. Email Inputs
If we set the input type to email, the browser will verify whether the input is of email type. Of course, we cannot just rely on the front-end verification, the back-end must also have corresponding verification
8. Placeholders
The meaning of this input attribute is that there is no need to use javascript to achieve the placeholder effect
9. Local Storage
Use Local Storage to permanently store large data Fragments are on the client side (unless deleted actively). Most browsers currently support it. You can check whether window.localStorage exists before using it.
10. Semantic header and footer
11. More HTML5 form features
12. IE and HTML5
By default, new HTML5 elements are rendered inline, but you can
render them in block mode through the following method
header, footer, article, section, nav, menu, hgroup {
display: block;
}
Unfortunately, IE ignores these styles. You can fix them as follows:
document.createElement( "article");
document.createElement("footer");
document.createElement("header");
document.createElement("hgroup");
document.createElement("nav ”);
document.createElement(”menu”);
13. hgroup
is generally used in the header to group a group of titles together, such as

<header> 
<hgroup> 
<h1 id="nbsp-Recall-nbsp-Fan-nbsp-Page-nbsp"> Recall Fan Page </h1> 
<h2 id="nbsp-Only-nbsp-for-nbsp-people-nbsp-who-nbsp-want-nbsp-the-nbsp-memory-nbsp-of-nbsp-a-nbsp-lifetime-nbsp"> Only for people who want the memory of a lifetime. </h2> 
</hgroup> 
</header>

14. Required attribute
The required attribute defines whether an input is required. You can declare it like the following

or

15. Autofocus attribute
Just like its meaning , that is, focus on the input box

16. Audio support
provided by HTML5 With the

<audio autoplay=”autoplay” controls=”controls”> 
<source src=”file.ogg” /><!–FF–> 
<source src=”file.mp3″ /><!–Webkit–> 
<a href=”file.mp3″>Download this file.</a> 
</audio>

17. Video support
Much like Audio, the

<video controls preload> 
<source src=”cohagenPhoneCall.ogv” type=”video/ogg; codecs=’vorbis, theora’” /> 
<source src=”cohagenPhoneCall.mp4″ type=”video/mp4; ’codecs=’avc1.42E01E, mp4a.40.2′” /> 
<p> Your browser is old. <a href=”cohagenPhoneCall.mp4″>Download this video instead.</a> </p> 
</video>

18. Preliminary Loading the video
The preload attribute is as simple as it sounds. You need to decide whether you need to preload the video when the page loads.

<form action=”" method=”post”> 
<label for=”username”>Create a Username: </label> 
<input type=”text” name=”username” id=”username” placeholder=”4 <> 10″ pattern=”[A-Za-z]{4,10}” autofocus required> 
<button type=”submit”>Go </button> 
</form>

21. Detecting attribute support
In addition to Modernizr, we can also simply detect whether some attributes are supported through javascript, such as:

<script> 
if (!’pattern’ in document.createElement(’input’) ) { 
// do client/server side validation 
} 
</script>

22. Mark元素
把元素看做是高亮的作用，当我选择一段文字的时候，javascript对于HTML的markup效果应该是这样的：

Search Results

They were interrupted, just after Quato said, ”Open your Mind”.

23. 什么时候用

HTML5已经引入了这么多元素，那么p我们还要用吗？p你可以在没有更好的元素的时候去用。
24. 想立即使用HTML5?
不要等2022了，现在就可以使用了，just do it.
25. 哪些不是HTML5
1)SVG
2)CSS3
3)Geolocation
4)Client Storage
5)Web Sockets
26. Data属性

<p id=”myp” data-custom-attr=”My Value”> Bla Bla </p> 
CSS中使用： 
<style> 
h1:hover:after { 
content: attr(data-hover-response); 
color: black; 
position: absolute; 
left: 0; 
} 
</style> 
<h1 id="nbsp-Don-t-nbsp-Touch-nbsp-Me-nbsp"> Don’t Touch Me </h1>

27. Output元素

元素用来显示计算结果，也有一个和label一样的for属性
28. 用Range Input来创建滑块
HTML5引用的range类型可以创建滑块，它接受min, max, step和value属性
可以使用css的:before和:after来显示min和max的值

<input type=”range” name=”range” min=”0″ max=”10″ step=”1″ value=”"> 
input[type=range]:before { content: attr(min); padding-right: 5px; 
} 
input[type=range]:after { content: attr(max); padding-left: 5px;}

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