The role/syntax of html tag attributes
1. Each element has its own unique features, which can be set through attributes.
2. Attributes: must be written in the starting tag. If it is a single tag, write it directly. Within the tag
3. The basic format of the attribute: attribute name="attribute value", the value can be in quotes, or without quotes, or in single quotes,
It is recommended to use double quotes , this is an industry convention that everyone is abiding by
1. The
tag has some special attributes, such as an id attribute, which is used to uniquely identify it on the page, just like its ID number
2.title is also an attribute of the
tag. When the mouse moves over the title, this prompt message will be displayed after a while.
3.Attribute value, Whether it is a string or a numerical value, all are enclosed in double quotes. For example, width is a number, but it must also be enclosed in double quotes
4. For the image tag, the width and height attributes. In fact, just set any one of them, and the other attribute will automatically scale
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>标签属性的作用/语法/作用</title> </head> <body> <!--<h2>标签中有用户输入的文本,所以是双标签 --> <h2 id="title" title="我是标题">PHP中文网第二期线上培训班开课啦~~</h2> <!-- <img>标签中的内容来自一个外部文件,所以使用单标签来表示 --> <img src="../images/3.jpg" width="280" height="300"> <img src="../images/3.jpg" width="280"> <!-- 仅设置宽度 --> </body> </html>
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