3 ways to introduce CSS basic syntax
This time I will bring you CSS basic syntax3 types of introduction of CSS, CSS basic syntax of CSS three types of introductionWhat are the precautions, the following are practical cases, one Get up and take a look.
CSS can be regarded as a breakthrough in web design. It solves the problem of web interface layout. It can be said that HTML tags mainly define the content of web pages (Content), while CSS determines how the content of these web pages is displayed (Layout).
In the early days of the Web, HTML was a very limited language. This language didn't care about appearance. It was just a concise small markup mechanism.
With the emergence of the Mosaic web browser, websites began to pop up everywhere. The need to change the appearance of the page increased, so markup elements like and were added.
A few years later, most website markup consists almost entirely of tables and font elements, and cannot convey any actual meaning to the content to be expressed, making the document less usable and difficult to maintain.
So in 1995, W3C released a CSS draft in an attempt to solve the problem of mixed structure and style.
In 1996, W3C officially launched CSS1.
In 1998, CSS2 was launched.
Starting from CSS3 in 2001, the CSS language was divided into multiple independent modules. Each module was independently graded and contained only a small part of the functionality.
Started designing CSS4 in 2011
1. Introduction of css style sheet
1. Embedded style sheet
Embedded style sheet is written in Tag (label) inside. Inline styles are only valid for the tag where they are located. (If there are multiple styles, the inline will override other styles and take effect on its own)
Example:
<p style="font-size:20pt; color:red"></p>
This style definition
The text is in 20pt font and the font color is red.2. Internal style sheet
The internal style sheet is written in the
of HTML. Internal style sheets are only valid for the web page in which they are located.The internal style sheet needs to use the style tag, which is written as follows:
<style type="text/css">
div{
color : red;
}</style>3. External style sheet
If many web pages need to use the same style (Styles), Use external style sheets. The external style sheet needs to write the style in a css file, then introduce it into the page using the tag, and introduce the file into each page that needs to apply the style.
Example:
<HTML><HEAD> <link href="../css/a.css " rel ="stylesheet" type="text/css "></HEAD><BODY>…</BODY> </HTML>
priority: Inline > Embedded > External
There are alsoComments statements in CSS: Use /*Comment statement*/ to indicate (use in Html)
I believe you have mastered the method after reading these cases. For more exciting information, please pay attention to other php Chinese websites related articles! Related reading:How to convert decimal numbers to hexadecimal
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