Application and OS support

Below please find an outline of the application and OS support as well as Known issues for each b-ber Output format. The two output formats for the browser, the Reader and Web builds, are currently being pinned to last two browser versions and greater than 2% of global usage. In the future, this will be support will increase to greater than 1% of global usage.

Legend

• ✅ Full support
• ⚠️ Partial support
• 🚫 Not supported
• 👩‍💻 Requires further testing

Output formats

EPUB

Application and OS	Version	Support	Notes
Books macOS	1.10+	✅
Books iOS	4.2.3+	✅
Marvin iOS	2.9.1+	✅
Google Play Books iOS	5.2.3	⚠️	HTML5 Audio and Video elements do not render
Google Play Books Android		👩‍💻
Kobo	4.33	⚠️	When sideloading an EPUB, "To trigger the Kobo WebKit, change the file extension to '.kepub.epub'." Find out more here.

Reader

Mobile

Application and OS	Versions	Support	Notes
Safari iOS	12.0+	✅
Chrome iOS	TK	✅
Chrome Android	75+	✅
UC Browser Android	12.12+	✅
Opera Mini	all	✅
Samsung Internet	9.2+	✅

Desktop

Application and OS	Versions	Support	Notes
Chrome macOS	74+	✅
Safari macOS	12.0+	✅
Firefox macOS	67+	⚠️	The break-before and break-after properties are not currently supported in Firefox.
Firefox Windows	67+	⚠️	The break-before and break-after properties are not currently supported in Firefox.
IE Windows	<=11	🚫
Edge Windows	17+	👩‍💻

Mobi

Application and OS	Versions	Support	Notes
Amazon Kindle macOS	1.26.1+	️⚠️	JavaScript is not fully supported by the Kindle application. Please see the Amazon Kindle Publishing Guidelines for more information.
Amazon Kindle iOS	6.21+	⚠️	JavaScript is not fully supported by the Kindle application. Please see the Amazon Kindle Publishing Guidelines for more information.
Amazon Kindle Android	Varies with device	👩‍💻	JavaScript is not fully supported by the Kindle application. Please see the Amazon Kindle Publishing Guidelines for more information.
Amazon Kindle Paperwhite	2016+	⚠️	JavaScript is not fully supported by the Kindle application. Please see the Amazon Kindle Publishing Guidelines for more information.
Amazon Kindle Fire	2016+	👩‍💻	JavaScript is not fully supported by the Kindle application. Please see the Amazon Kindle Publishing Guidelines for more information.

Web

Mobile

Application and OS	Versions	Support	Notes
Safari iOS	12.0+	✅
Chrome iOS	TK	✅
Chrome Android	75+	✅
UC Browser Android	12.12+	✅
Opera Mini	all	✅
Samsung Internet	9.2+	✅

Desktop

Application and OS	Versions	Support	Notes
Chrome macOS	74+	✅
Safari macOS	12.0+	✅
Firefox macOS	67+	✅
Firefox Windows	67+	👩‍💻
IE Windows	<=11	🚫
Edge Windows	17+	👩‍💻

PDF

Platform	Versions	Support	Notes
Preview macOS	9.0	✅
Adobe Acrobat macOS	2019.012.20034	✅

Known issues

Kindle (Mobi/KF8 build type)

Device	Issue
Paperwhite	Image linking (forward/back between body and figures) does not work on a single tap. The image in the body text must be held until the user is prompted to enlarge the image or navigate to the figures section. This behavior does not affect normal image figure linking.
Paperwhite	Page breaks before and after are not respected for inline figures that are embedded within a dialogue directive. This likely has to do with how Calibre inserts page breaks into the document and may be fixed in the future.
Paperwhite	Footnotes appear twice in the pop-up that is triggered when clicking on the reference.
Paperwhite	Footnotes have a back-link in the pop-up. This can be removed during build, but is present as a fallback for older Kindle versions that do not support the pop-up footnote behavior.
Paperwhite	Paragraphs in footnotes are indented. This may be possible to resolve by removing the p tags in the list elements, but would require hacking into the Markdown parser. This may be fixed in the future.

Google Play (EPUB build type)

Device	Issue
iOS, Desktop	Audio and video do not render and fallbacks are not displayed to the user. In addition, opening web inspector shows that the A/V elements are stripped entirely from the project. In 2018, Google Play support has confirmed that this will not be fixed.

Apple Books app (EPUB build type)

Device	Issue
macOS	Outbound links do not function in footnote pop-up windows. Links are highlighted but do not respond to click events.