Cross-browser compatibility testing requires first clarifying the target browser scope, then using automation tools to assist detection, paying attention to common problems, and testing key scenarios hands-on. 1. Determine the browser and version to support according to the user group, and set priority based on the access data; 2. Use tools such as BrowserStack, Lighthouse, Puppeteer to improve testing efficiency, and automatically execute core tests in combination with CI/CD processes; 3. Focus on issues such as layout disorder, JavaScript syntax support, CSS private prefix, and input behavior differences; 4. Test key paths such as login registration, form submission, media loading, and interactive components to ensure normal functions.

The core of testing cross-browser compatibility issues is to ensure that the website can display and run normally on different browsers. Although modern browser standards are becoming increasingly unified, inconsistent performance may still occur due to differences in kernel, rendering methods, JavaScript engines, etc. Below are some practical methods and suggestions to help you discover and solve these problems more efficiently.

1. Determine the target browser range

Not every browser needs to be tested, the key point is to see which browser your user group mainly uses. for example:

• Domestic users may use Chrome, Edge and Safari more (Mac/iOS users)
• Firefox usage rate is relatively higher in the European and American markets
• If you are serving enterprise customers, IE11 or older versions of Edge may also need support (although fewer and fewer are now)

suggestion:

• View the access data of the website (such as Google Analytics) to find out the mainstream browser and its version
• Set priority according to project requirements, such as whether it supports mobile browsers or old versions

2. Use automation tools to assist detection

It takes too time to open the browser one by one manually, so you can use some tools to improve efficiency:

• BrowserStack / CrossBrowserTesting : an online platform that can remotely operate various browser environments, suitable for quick checking of layout and interaction
• Lighthouse : Chrome extension, can analyze page performance, accessibility, etc., and can also run in multiple browsers
• Puppeteer / Playwright : If you have a front-end test foundation, you can write end-to-end test scripts and automatically run the key processes in multiple browsers.

Tips:

• Automation cannot completely replace manual inspections, especially visual issues
• You can combine the CI/CD process to automatically run the core test cases every time you submit the code.

3. Pay attention to common compatibility issues

Some places are particularly prone to problems and need to focus on:

Layout is inconsistent

• Different browsers may have slightly different default resolutions for Flexbox and Grid
• Use reset.css or normalize.css to reduce initial style differences

JavaScript support level

• New syntax (such as optional link ?. ) may report an error in old browsers
• Use Babel to translate the code and configure browserslist

CSS Features

• -webkit- The private prefix starting with is invalid in non-Webkit browsers
• Gradient, shadow, animation and other effects need to be tested more

Differences in input behavior

• The layout changes caused by the mobile keyboard pop-up
• Safari's handling of position: fixed is different from Chrome

4. Actual hands-on test several key scenarios

Even if you have tools, it is recommended to experience the key paths for yourself:

• Is the login and registration process smooth?
• Is there any exception in the form submission?
• Is the picture lazy loading and the video playback normal?
• Are the interactive components such as pop-up windows and drop-down menus available?

You can install multiple browsers (Chrome, Firefox, Safari, Edge) locally, or use a virtual machine to test the performance under different systems.

Basically that's it. Cross-browser testing looks simple, but there are many details. The key is to plan the target scope in advance, combine tools and manual verification to control the problem before going online.

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