html replacement content

Many people have heard of the word HTML. It is the abbreviation of Hyper Text Markup Language, a standard language for creating web pages. HTML is widely used, not only on PC browsers, but also on mobile devices and smart TVs. Therefore, learning and mastering HTML is very important.

In HTML, we can use tags to create text, images, links and other elements. Among them, some tags are used to replace content, which means that the replacement content tag usually does not have actual content, but the replacement content is provided as an attribute or sub-element of the tag. In this article, we’ll cover some common replacement content tags.

1. img tag

The img tag is used to insert images into web pages. This tag has no actual content, its content is provided through the src attribute. At the same time, the img tag can also contain the alt attribute, which is used to provide a replacement text to display when the image cannot be loaded. The following is an example of an img tag:

<img src="/static/imghwm/default1.png"  data-src="image.jpg"  class="lazy" alt="这是一张图片">

2. audio and video tags

HTML5 adds two new replacement content tags, audio and video. They are both used to insert audio and video into web pages without actual content. These tags use the src attribute to provide the address of the audio or video, and there are some compatibility differences due to different browsers. The following is an example of an audio tag:

<audio src="music.mp3" controls></audio>

3. input tag

The input tag is used to create various form elements, such as text boxes, radio buttons, and checks. boxes and buttons etc. The content of this tag is also provided by different attributes, and the input tag usually does not need to be closed. Here are some common input tags:

<input type="text" name="username">

<input type="radio" name="gender" value="male">男
<input type="radio" name="gender" value="female">女

<input type="checkbox" name="hobby" value="reading">阅读
<input type="checkbox" name="hobby" value="music">听音乐

<input type="submit" value="提交">

4. iframe tag

The iframe tag is used to insert another HTML page. The content of this tag is provided through the src attribute, and the width and height of the iframe can be set using the width and height attributes. The following is an example of an iframe tag:

<iframe src="http://www.mywebsite.com" width="800" height="600"></iframe>

Summary

Through the above examples, we can see the role and usage of the replacement content tag in HTML. These tags will not have actual content, but content will be provided through attributes or sub-elements. Mastering these tags allows us to create web pages and forms more flexibly, giving users a better experience.

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