Enhancement: Sizing in relative terms

[mathdebate09]

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• This is not a duplicate of an existing issue (please have a look through our open issues list to make sure)
• I have thoroughly read and understand Contributing Guide
• Would you like to work on this enhancement?

Describe the enhancement

implement w/h for keywords like full 1/3 2/3 etc relative values

Describe the solution you'd like

use 'num% values

Describe alternatives you've considered

(Optional) Additional Comments

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[github-actions]

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