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This article mainly introduces the relevant knowledge of what the CSS optimization skills are, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value, I believe you will have something to gain after reading this CSS optimization skills, let's take a look at it.

1. Brief introduction to CSS

CSS (Cascading Style Sheet), also known as cascading style sheets. Using CSS technology, we can effectively control the layout, font, color and background of the page.

CSS completely separates the display description from the document structure in the web page, avoids the confusion between the document structure and the display format description caused by using HTML tags alone, and improves the readability of the code. CSS controls the layout of the page as a whole. Using the same style file or stylesheet with the same name can control the content of the same format, saving a lot of code. However, currently, search engines do not parse CSS content. If each style in the page is controlled by CSS, the search engine will not be able to identify the style of the relevant content in the page, nor can it judge the relevance of the page according to the style of the content.

As shown below, the purpose of mode 1 and mode 2 is to add bold tags to SEO. Mode 1 is achieved by calling the b style in CSS, while mode 2 uses bold tags directly. Because the search engine does not parse the content in the stylesheet, it cannot identify whether the content in mode 1 is marked in bold, while mode 2 can be easily identified, thus giving the page of mode 2 a corresponding weight.

Method 1: search engine optimization

Mode 2:

Search engine optimization

The contents of the style sheet:

2. CSS optimization

CSS optimization is mainly to change the way of calling CSS and avoid using CSS to define styles for important content, in order to achieve the purpose of simplifying page code and improving page relevance.

By changing the way CSS is called and using CSS to control the same style of content, a lot of code can be saved.

Avoid using CSS to style important content. The style of the important content in the page (especially the primary and secondary keywords) must be marked with HTML tags in order to highlight the primary and secondary keywords in the page and improve the relevance of the page. Such as bold, italic, underline, title, text color, text size, etc.

3. CSS calling method

CSS calls are divided into two types: internal calls and external calls, in which the internal call is divided into header call and body call.

Header call

The page header call is to place the CSS-style content that you need to use directly in the header of the page (that is, the area). If the style content is very little, it will not only greatly increase the volume of the page, but also occupy the important position at the top, which will have a great negative impact on the page. The following code is shown:

Subject invocation

The page body call is to add the corresponding CSS style to the content that the page body 1 needs style control. This way of calling CSS does not take advantage of CSS (that is, using the same style to control the content of the same style), but also greatly increases the amount of page code. As follows:

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