Why do custom stylesheets sometimes fail to take effect in Safari?

Analysis of the causes of failure of Safari custom style sheet

Safari browser allows users to customize style sheets to achieve personalized web page customization. However, custom stylesheets may fail in some cases. This article will analyze a specific case and explain the reasons for its failure.

Users add custom CSS stylesheets to Safari preferences and try to set the local image as the web page background. The code is as follows:

 body {
    background-image: url("/users/luxury/desktop/wallhaven-o5762l.png") !important;
}

Test results:

1. In the local web page (file protocol), the style sheet takes effect and the background image is displayed normally.
2. In Baidu web page (http protocol), the style sheet is invalid and the background image cannot be displayed.

Cause analysis:

Local web pages use the file protocol to directly access pictures in the local file system. When accessing Baidu web pages, the image path that the browser tried to load is http://www.baidu.com/users/luxury/desktop/wallhaven-o5762l.png . This path obviously does not exist, resulting in the image loading failure. Although the style sheet itself is applied, the background image display fails due to resource loading failure.

Therefore, in web development, you should avoid using the file protocol to access project resources (unless temporarily debugged), and you should not use local absolute paths as resource reference address. After deploying a web page to the server, the local path cannot be resolved to the correct server path, resulting in resource loading failure.

In addition, there may be special features in how Safari handles the introduction of local files by user custom style sheets. It is recommended to try to modify the code and use background attribute to set the color and image path at the same time:

 body {
    background: #ffbebe url("/Users/luxury/Desktop/wallhaven-o5762l.png") !important;
}

This method verifies the mechanism by which Safari handles the introduction of local files in user-defined style sheets. Through the above analysis, we can better understand the reasons why Safari custom style sheet fails and find corresponding solutions. The key is to understand the protocol differences and the correct settings of resource paths.

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