CSS (Cascading Style Sheets) is a style markup language used for web design, usually stored in external style sheets and linked in HTML documents. Below we will introduce how CSS style sheets are stored.
- Inline style
Inline style refers to writing CSS code directly in the HTML tag, as shown below:
<div style="color: red; font-size: 16px;">Hello World!</div>
Although inline The style is very simple, but it has significant limitations. Because CSS code is often complex, using inline styles to describe the style of an entire website would be very tedious. In addition, if you need to change the style, you usually need to modify the code of each inline style tag, which is also very time-consuming and labor-intensive.
- Embedded style
Embedded style refers to writing CSS code directly in the tag of the HTML document, using <style></style> element is wrapped as follows:
<head>
<style>
body {
background-color: #f0f0f0;
font-family: Arial, sans-serif;
font-size: 16px;
color: #333;
}
h1 {
color: #ff0000;
font-size: 24px;
font-weight: bold;
}
</style>
</head>Using embedded styles, CSS code can be referenced in the same HTML document. The advantage of this is that if you need to change the style, you only need to modify one style sheet instead of having to modify the code in each HTML document.
- External style sheet
External style sheet refers to storing CSS code in a separate CSS file and referencing it in the HTML document. The advantage of this is that multiple HTML files can share a CSS file, making the maintenance and management of the website more convenient. External style sheets typically use the .css file extension, as shown below:
In the style.css file:
body {
background-color: #f0f0f0;
font-family: Arial, sans-serif;
font-size: 16px;
color: #333;
}
h1 {
color: #ff0000;
font-size: 24px;
font-weight: bold;
} Referenced in the HTML document style .css Files:
<head> <link rel="stylesheet" type="text/css" href="style.css"> </head>
Using external style sheets can greatly simplify code writing and maintenance. By separating the CSS code from the HTML document, the file size of the page can be reduced, allowing the web content to be delivered to the user more quickly. In addition, you can also use the browser's caching mechanism to reduce page loading time and improve website performance and user experience.
In summary, CSS can be stored as inline styles, embedded styles and external style sheets. Through these different storage methods, we can flexibly apply CSS to meet different development needs. But generally speaking, using external style sheets is the most common way because it has the advantages of concise code, easy maintenance, and cache optimization.
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