What is the reason why the EPUB e-book line height setting fails in multi-view readers?

Solutions to the failure of high settings of EPUB e-book lines for multi-view readers

When creating EPUB e-books, many users will use CSS style (such as line-height: 4em ) to adjust the line height, but the actual effect is often inconsistent with expectations. Many users have reported that in the multi-view reader, even if the line-height attribute is set, the line spacing does not change. Other software (such as Calibre) or browsers can display it normally. What is this difference?

The root cause of the problem lies in the special handling of CSS styles by viewing more readers. To optimize the reading experience, the multi-view reader may custom parse and render the CSS style of the EPUB file, which is different from the standard CSS rendering engine, causing it to ignore or overwrite the user-defined line-height property.

In addition, different CSS parsing methods of different readers or browsers will also lead to different display results in row height settings. The final display effect depends on the reader's rendering engine.

Therefore, to adjust the line height in the multi-view reader, it is recommended to try the following methods:

• Built-in settings for using multi-view readers: Multi-view readers usually come with line spacing adjustment function, so it is recommended to use this function first.
• Try other CSS properties: In addition to line-height , you can also try to adjust the line spacing indirectly, such as margin-bottom , but this requires more in-depth knowledge of typesetting.
• Check the EPUB file structure: Make sure the EPUB file structure is correct and the application scope of CSS style is correct. An incorrect structure may cause the CSS style to fail to take effect.

The special treatment of line-height by multiple viewers is the main reason for this problem. Users need to choose appropriate adjustment strategies based on actual conditions to obtain ideal line spacing effects.

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