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Doitsu · 03-09-2025, 10:17 AM

@Mazarin07 The role and data-* attributes were introduced in the HTML5 specs. I.e., they can only be used in epub3 books.
A relatively easy fix would be to convert your epub2 book to an epub3 book with KevinH's ePub3-itizer plugin.

03-09-2025, 10:17 AM	#4
Doitsu Grand Sorcerer Posts: 5,739 Karma: 24031403 Join Date: Dec 2010 Device: Kindle PW2	@Mazarin07 The role and data-* attributes were introduced in the HTML5 specs. I.e., they can only be used in epub3 books. A relatively easy fix would be to convert your epub2 book to an epub3 book with KevinH's ePub3-itizer plugin.