Some CSS styling basics-CSS Tutorial-php.cn

Some CSS styling basics

jacklove

Release： 2018-05-21 11:24:43

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You will encounter some basic knowledge of CSS during your study. This article introduces some basic knowledge of CSS styles.

How many ways are there to introduce the style? What is the difference between link and @import

There are three ways to introduce the style, which are:

External introduction
Mainly used The link tag or @import tag introduces a style file with the suffix .css from the outside. The syntax is:
.css" >

@import url(path

.css);

embedded

Write the style in the current tag, the syntax is:

<style>
   p {color:red;    text-align:center;
 }</style>

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Inline

Add the style within the opening tag of the style you want to add (cannot be added in the closing tag), the syntax is:

I am P tag content

The main difference between link and @import is:

The difference in browser loading order. (Load link first, then load @import)

link has better general compatibility than @import

link supports using JS to control the DOM to change the style; while @import does not support

What are the differences between file paths ../main.css, ./main.css, and main.css

../main.css represents the main.css file in the upper-level directory

./main.css represents the main.css file in the current directory.

main.css represents the main.css file in the current directory, which is equivalent to ./main.css.

What is console.log used for? The

console.log is mainly used for development and debugging, and displays the debugged object in the console of the inspection element. The function is equivalent to: alert() (not very understandable, need to be studied in depth)

text-align: What is justify

It is mainly used to adjust the gap in the middle to align both sides in the layout of large text.

What are px, em and rem? What's the difference? How to use

px as the pixel unit is generally hard-coded and there will be no other interference factors.

em and rem are relative units and are changeable. em is the change in unit size relative to the parent element, and rem is the change in unit size relative to the root node. For example:

<!DOCTYPE html><html style="font-size:15px"> <!--这里是根节点，设置为15px--><head>
  <title>px.em.rem区别</title></head>
  <body>我是body内容  
  <h1>我是标题内容</h1>
  <div  style="font-size:2em;border:red 1px solid"><!--em相对于父级html，html为15px，2em相当于30px-->
  我是div内容  <p style="font-size:2em">我是em</p>  <!--em相对于父级div,div为30px，2em相当于60px--><p style="font-size:2rem">我是rem</p><!--rem是相对于根节点，根节点为15px，2rem相当于30px--></div></body></html>

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This article introduces the basic knowledge of css style. For more related content, please pay attention to the php Chinese website.

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