There are three ways to insert web pages in CSS: 1. Inline styles are suitable for single element modification or debugging, but are not conducive to maintenance and reuse; 2. Internal style sheets are suitable for small projects or test pages, and the current page style is unified but cannot be shared across pages; 3. External style sheets are most recommended, suitable for multi-page projects, centrally manage styles, improve maintenance and loading speed. In actual development, external style sheets are preferred, and the other two methods are considered in special circumstances.
CSS can be inserted into web pages in three main ways, each suitable for different scenarios and requirements. The following is a direct explanation of these three methods and give suggestions based on actual usage.
1.Inline style (Inline CSS)
This is the most straightforward way: write the CSS style in style property of the HTML tag. For example:
<p style="color: red; font-size: 16px;">This is a red paragraph</p>
Applicable scenarios : only used to modify the style of a single element, or to quickly view the effect during debugging.
Reasons for not recommending long-term use :
- Not conducive to maintenance: style and structure are mixed together, and it is difficult to modify later.
- Unable to reuse: The same style needs to be repeated multiple times.
- Not in line with the best practice of "separating content and performance".
2. Internal style sheet (Internal CSS)
Use the <style> tag to define CSS styles in the <head> section of the HTML document:
<head>
<style>
body {
background-color: #f0f0f0;
}
h1 {
color: blue;
}
</style>
</head>Applicable scenarios : suitable for small projects or test pages with small page counts and no sharing styles.
advantage :
- Cleaner than inline styles.
- You can uniformly control the style of the current page.
shortcoming :
- Styles cannot be shared between multiple pages, and repeated writing styles will still cause maintenance problems.
3. External stylesheet (External CSS)
Write CSS in a separate .css file and then import it through the <link> tag in HTML:
<link rel="stylesheet" href="styles.css">
And the content of the styles.css file may be:
body {
background-color: #fff;
}
h1 {
color: green;
}Applicable scenarios : This is the most recommended way, suitable for most websites, especially when multiple pages require sharing styles.
advantage :
- Easy to maintain: Centrally managed all styles.
- Improve readability: HTML and CSS separation.
- Improve loading speed: The browser can cache CSS files.
Basically that's it. The three methods have their own uses, but in actual development, external style sheets are preferred , and internal style sheets or inline styles will only be considered in special cases.
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