Replace percentage types by combined <*-percentage> types

[SebastianZ]

CSS Values and Units 3 defines several combined percentage data types, which clarify how the percentages will be computed in the end. These types should be used within the syntax definitions of the other specifications.

Affected specifications are:

• CSS 2.2 (see issue Add combined <*-percentage> data types from V&U to CSS 2.2 #504)
• CSS Backgrounds 3 (partly done in [css-backgrounds] Replaced <length> | <percentage> by <length-percentage> #263, see issue [css-backgrounds][css-position-3][css-transforms][css-text-3] Adjust value descriptions to reflect combined <*-percentage> values #645)
• CSS Backgrounds 4 (done in [css-backgrounds] Replaced <length> | <percentage> by <length-percentage> #263)
• CSS Color 4 (No, because percentages are not computed to numbers)
• CSS Fonts 3 (done in [css-fonts] Replaced <length> | <percentage> by <length-percentage> #265)
• CSS Grid 1
• CSS Images 3 (done in [css-images] Replaced <length> | <percentage> by <length-percentage> and <angle> | <percentage> by <angle-percentage> #268)
• CSS Images 4 (done in [css-images] Replaced <length> | <percentage> by <length-percentage> and <angle> | <percentage> by <angle-percentage> #268)
• CSS Page Floats 3 see [css-page-floats-3] Replace percentage types by combined <*-percentage> types #10079
• CSS Position 3 (see issue [css-backgrounds][css-position-3][css-transforms][css-text-3] Adjust value descriptions to reflect combined <*-percentage> values #645)
• CSS Scroll Snap 1
• CSS Shapes 1
• CSS Transforms 1 (see issue [css-backgrounds][css-position-3][css-transforms][css-text-3] Adjust value descriptions to reflect combined <*-percentage> values #645)
• CSS Sizing 3
• CSS Sizing 4
• CSS Speech 1 see [css-speech-1] Replace percentage types by combined <*-percentage> types #10080
• CSS Tables 3
• CSS Template 1 see [css-template-1] Replace percentage types by combined <*-percentage> types #10081
• CSS Text 3 (see issue [css-backgrounds][css-position-3][css-transforms][css-text-3] Adjust value descriptions to reflect combined <*-percentage> values #645)
• CSS UI 4 (doesn't have any percentages anymore)

Sebastian