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Originally Posted by JSWolf
Please show me any set of ePub specs that show webkit code as part of the specification. Thanks.
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ePub 3.3 standard:
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6.3.1.3 Prefixed properties
Earlier version of EPUB included prefixed CSS properties, as many CSS features related to world languages were not yet mature. To ensure backwards compatibility for content authored using these prefixes, they have been retained in this specification. Unless otherwise noted, prefixed properties and values behave exactly as their unprefixed equivalents as described in the appropriate CSS specification. The prefixed properties are documented in E. Prefixed CSS properties.
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Granted, it does continue with a caution that you should use the unprefixed css as much as possible because there is no telling how long they will stay supported… but, as of now, they are…
Also, even if the device/app does NOT support them, they are required to degrade gracefully…. In other words - ignore it.