The reading problem
Let paragraphs and lines breathe without forcing fixed boxes.
A concrete example
A notice with cramped lines can feel like a single block even when the sentences are short. More leading and visible paragraph breaks may help, but rigid-height boxes can clip text after a reader increases spacing.
Try this edit
Try a line-height around 1.5 as a starting point and allow the block to grow. Check it after enlarging text and spacing. Treat this as visual inspection, not an automatic pass.
Proof on the page
Take a crowded two-paragraph notice and make a duplicate. In the duplicate, leave the words unchanged but set the line height near 1.5 and add a visible gap between paragraphs. Compare where the second topic begins. Then increase browser text size; if a fixed-height box clips the last line, remove the fixed height instead of shrinking the type to force it back inside.
Where the method stops
W3C text-spacing guidance concerns whether users can override spacing without losing content or function. It does not say every authored paragraph must use one exact value. The test here is local and visual. Check the real delivery format, including print or PDF if relevant, because a browser preview cannot reproduce every layout engine.