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kovidgoyal · 11-02-2015, 08:22 PM

For completeness, the CSS spec requires elements whose heights use percentage to ignore the percentage unless the parent element has a fixed height. This requirement is not enforced in HTML mode (quirks mode) but is enforced in XHTML mode (standards compliant mode). If you have been using percentages as a way to achieve full screen images, you should stop doing that for while it works in most readers, it is not actually standards compliant.

Use an SVG wrapper instead.

See https://developer.mozilla.org/en-US/..._Mode_Behavior

11-02-2015, 08:22 PM	#3
kovidgoyal creator of calibre Posts: 45,418 Karma: 27757236 Join Date: Oct 2006 Location: Mumbai, India Device: Various	For completeness, the CSS spec requires elements whose heights use percentage to ignore the percentage unless the parent element has a fixed height. This requirement is not enforced in HTML mode (quirks mode) but is enforced in XHTML mode (standards compliant mode). If you have been using percentages as a way to achieve full screen images, you should stop doing that for while it works in most readers, it is not actually standards compliant. Use an SVG wrapper instead. See https://developer.mozilla.org/en-US/..._Mode_Behavior