CSS rules implied when working with percentage (%) unit

CSS rules implied when working with percentage (%) unit
Recently I was working on an assignment where-in I was positioning element w.r.t. parent element and setting height of 100%. I expected that, the child container will take up all the available parent height but that was not the case. On digging-down

Illustrated CSS: Values and Units of CSS, by w3cplus

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Illustrated CSS: Values and Units of CSS, by w3cplus

CSS rules implied when working with percentage (%) unit

CSS : How to calculate percentages in LESS CSS?

Illustrated CSS: Values and Units of CSS, by w3cplus

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