What is the difference between using link and import?

The difference between using link and import lies in function, purpose, introduction method, compatibility and applicable scenarios, etc. Detailed introduction: 1. The link tag is used to introduce an external style sheet. It can associate the external style sheet with the HTML document to control the style and layout of the document. The link tag can be used in the head part or body part of the HTML document; 2 The import tag is used to introduce external HTML documents, which can embed one HTML document into another HTML document, modularize and reuse, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

In HTML, `link` and `import` are two tags used to introduce external resources. They have some differences and applicable scenarios. The following are their main differences:

1. Function and purpose:

- `link` tag: The `link` tag is used to introduce external style sheets (CSS files), which can Style sheets are associated with HTML documents to control the style and layout of the document. The `link` tag can be used in the `head` section or the `body` section of an HTML document.

- `import` tag: The `import` tag is used to introduce external HTML documents (or HTML templates). It can embed an HTML document into another HTML document to achieve modularization and reuse. The `import` tag can only be used in the `head` section of an HTML document.

2. Introduction method:

- `link` tag: When using the `link` tag, the browser will download and parse the external style sheet in parallel, without blocking the rendering of the page. This means that the content of the page can be displayed while the style sheet is loading, thus improving the loading performance of the page.

- `import` tag: When using the `import` tag, the browser will delay loading and parsing the imported HTML document until the main document is fully loaded and parsed. This means that the content of the page is blocked until the incoming HTML document is loaded.

3. Compatibility:

- `link` tag: `link` tag has good browser compatibility, almost all modern browsers support it.

- `import` tag: The `import` tag is a new tag in HTML5. Not all browsers support it. In some older browsers, the `import` tag may not be supported or may not work properly.

4. Applicable scenarios:

- `link` tag: Since the `link` tag is mainly used to introduce style sheets, it is suitable for situations where page style and layout need to be controlled. For example, you can use the `link` tag to bring in external CSS files to apply custom styles and themes.

- `import` tag: The `import` tag is suitable for situations where multiple HTML documents need to be combined together to achieve modularization and reuse. For example, you can use the `import` tag to embed components such as a common navigation bar, footer or sidebar into multiple pages.

It should be noted that with the development of technology, the use of `import` tag in web development is gradually decreasing, and more developers tend to use modular solutions, such as ES6 modularity syntax (`import` and `export` keywords) or front-end build tools (such as Webpack, Rollup, etc.) to manage and package modular code.

To sum up, the `link` and `import` tags are different in function, purpose, introduction method, compatibility and applicable scenarios. The `link` tag is used to introduce external style sheets, and the `import` tag is used to introduce external HTML documents. In actual development, appropriate tags are selected to introduce external resources based on specific needs and browser compatibility requirements. If you have any further questions please feel free to let me know.

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