For which styles is html2canvas invalid?

Invalid styles include CSS3 animations and transitions, CSS filter effects, CSS3 complex graphics and paths, some CSS3 features, pseudo elements and some CSS features, Z-index, background images and gradients, etc. Detailed introduction: 1. CSS3 animation and transition: html2canvas may not fully capture CSS3 animation and transition effects. Although attempts will be made to capture the final style, these animations and transitions may be lost during the conversion process; 2. CSS filter effects: filters such as blur and shadow may not be retained during the conversion process, etc.

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

html2canvas is a popular JavaScript library that allows you to convert HTML elements into Canvas elements so that you can save screenshots or otherwise manipulate them. However, due to the way html2canvas is implemented and browser limitations, some CSS styles may not be fully preserved during conversion. Here are some styles that may not be valid or fully compatible:

1. CSS3 animations and transitions: html2canvas may not fully capture CSS3 animations and transitions. While it will attempt to capture the final style, these animations and transitions may be lost in the conversion process.
2. CSS filter effects: Filters such as blur and shadow may not be retained during the conversion process.
3. CSS3 Complex graphics and paths: For some complex graphics and paths (such as polygons, curves, polylines, etc.), html2canvas may not be able to capture their styles completely accurately.
4. Some features of CSS3: Due to differences in browser support for CSS3, some newer CSS3 features may not be fully supported by html2canvas on some browsers.
5. Pseudo-elements and some CSS properties: html2canvas may have difficulty handling pseudo-elements and some CSS properties, such as ::before and ::after, as well as some specific CSS layout properties.
6. Z-index: During the conversion process, html2canvas may not fully handle the Z-index attribute of the element. This can cause elements to be stacked in an order that is inconsistent with the original HTML.
7. Background images and gradients: Some issues or limitations may arise when working with background images and gradients. For example, gradients may not convert completely accurately, and background images may not be visible after conversion.

In summary, if you wish to use html2canvas to transform complex web pages or applications, you should be aware that it may not perfectly capture all CSS styles and effects. When it comes to specific use, it's best to conduct adequate testing to ensure the results are what you expect.

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