9 front-end optimization tips worth collecting (improving web performance)-Front-end Q&A-php.cn

9 front-end optimization tips worth collecting (improving web performance)

In today’s digital world, there are countless websites that need to deal with visits for various reasons every day. However, a large number of these sites appear clunky and cumbersome to use. A poorly optimized website can suffer from a variety of issues, including loading times, lack of support for mobile devices, browser compatibility issues, and more.

This article describes techniques that can help improve and optimize the front-end, which is very useful. The main contents include cleaning code, compressing images, compressing external resources, using CDN, and some other methods. These methods will bring significant speed improvements and overall performance improvements to your website.

1. Clean the HTML document

HTML, the Hypertext Markup Language, is the backbone of almost all websites. HTML brings the formatting of titles, subtitles, lists, and other document structures to web pages. In the recent update to HTML5, it's even possible to create charts.

HTML is easily recognized by web crawlers, so search engines can update in real time based on the content of the website to a certain extent. When writing HTML, you should try to make it concise yet effective. In addition, there are some best practices that need to be followed when referencing external resources in HTML documents.

Place CSS Properly

Web designers like to create style sheets after the main HTML skeleton of a web page has been established. As a result, style sheets in web pages are often placed after the HTML, near the end of the document. However, the recommended approach is to place the CSS at the top of the HTML, within the document header, to ensure normal rendering.

<head>
</head>

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This strategy will not improve the loading speed of the website, but it will not make visitors wait for a long time looking at a blank screen or unformatted text (FOUT). If most of the visible elements of the web page have already been loaded, visitors are more likely to wait for the entire page to load, thereby optimizing the front-end. This is perceptual performance.

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Place Javascript Correctly

On the other hand, if you place JavaScript inside the head tag or in the upper part of the HTML document, this will block the loading process of HTML and CSS elements. This error will cause the page loading time to increase, increase the user's waiting time, and easily make people feel impatient and give up visiting the website. However, you can avoid this problem by placing the JavaScript attributes at the bottom of the HTML.

Also, when using JavaScript, people usually like to use asynchronous script loading. This prevents the