H5 semantic tags

This time I will bring you the semantic tags of H5. What are the precautions when using H5 semantic tags? Here are practical cases, let’s take a look.

HTML5 new features

Concise DOCTYPE:

HTML5 has only one simple document type : , indicating that the browser will parse according to the standard mode.

Simple and easy-to-remember encoding type

You can now use "charset" in the meta tag: <meta charset="”utf-8″">

Scripts and links do not require type

<link>
<script></script>

More semantic new tags

For example:

,

,

,

,

,

,

, , and

etc

Video and Audio

<video>
    <source></source>
    <source></source>
    Your browser does not support the video tag.
</video>

Form Enhancements

New Input types: color, email, date, month, week, time, datetime, datetime-local, number, range, search, tel, and url

New attributes: required, autofocus , pattern, list, autocomplete and placeholder

New elements: ,

canvas tag drawing 2D graphics.

var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
context.beginPath();
context.moveTo(100,100);
context.lineTo(300,300);
context.lineTo(100,500);
context.lineWidth = 5;
context.strokeStyle = "red";
context.stroke();

Geolocation acquisition

HTML semantics

1. What is HTML semantics?

Determine the semantics of the content through tags. For example, determine the content is a title based on the h1 tag, determine the content is a paragraph based on the

, and determine the tag is an input box, etc.

2. Why semantics?

1). When the style is removed or lost, the page can present a clear structure
2). Convenient for other devices to parse (such as screen readers, blind readers, mobile devices) to make sense Way to render web pages
3). Conducive to SEO
4). Facilitate team development and maintenance, follow W3C standards, can reduce differentiation

3. How to determine your tags Is it semantically sound?

Remove the style and see if the web page structure is well organized and orderly, and whether it is still very readable.

4. Common semantic tag modules

Form

    

        

登录表单

        

账号：

        

密码：

             

The form fields should be wrapped with fieldset tags, and the legend tag should be used to describe the purpose of the form. ;The description text corresponding to each input label needs to use the label tag, and by setting the id attribute for the input and setting for=someld in the label tag, the description text is associated with the corresponding input.

5. Some issues that should be paid attention to in semantic tags

Use unsemantic tags p and span as little as possible;
When the semantics are not obvious, When you can use p or p, try to use p, because p has upper and lower spacing by default, which is beneficial to compatibility with special terminals;
Do not use pure style tags, such as: b, font, u, etc., use css settings instead .
Text that needs to be emphasized can be included in the strong or em tag. The default style of strong is bold (do not use b), and em is italic (do not use i)

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

html5 How to achieve the animation effect of pictures turning in circles

How to automatically play background music in H5 videos

The above is the detailed content of H5 semantic tags. For more information, please follow other related articles on the PHP Chinese website!