SDK / exoplayer

CSS background-color isn't inherited to inner HTML elements by default:
https://developer.mozilla.org/en-US/docs/Web/CSS/background-color

But Android Span styling assumes an outer BackgroundColorSpan will
affect inner spans. This usually doesn't make a difference, because
HTML elements are transparent by default, so there's an implicit
inheritance by just being able to see through to the 'outer' element
underneath. However this doesn't work if the inner element sits outside
the bounding box of the outer element, e.g. <rt> (ruby text, sits above/below)
or a <span> with font-size > 100%.
END_PUBLIC

Demo of <rt> and font-size problems: http://go/cpl/ruby-backgrounds/1
Demo of CSS inheritance: http://go/cpl/css-inheritance/1

PiperOrigin-RevId: 320915999