[css-writing-modes] Can't analyze a passage and find it redundantly technical


I don't get the sense of this paragraph:


The content of replaced elements do not rotate due to the writing mode:
images and external content such as from <iframe>s, for example, remain
upright, and the default object size of 300px×150px does not re-orient.
However embedded replaced content involving text (such as MathML
content or form elements) should match the replaced element’s writing
mode and line orientation if the UA supports such a vertical writing
mode for the replaced content. 

To me, 'replaced' elements are gone! Why being exact on px values? Why
should boxes follow writing-mode? What about:

The writing mode does only affect text-related elements, including
embedded elements with content written in separate scripts like MathML,
if the User Agent supports this...

Dennis Heuer

Received on Monday, 15 January 2018 21:34:55 UTC