Created attachment 296510 [details] Testcase In the attached tests, I have two elements displaying text with "font-size" set to "14px" and "zoom" property set. The element that has "zoom" set to 4 reports a font-size of "14px" in its computed style, while the element that has "zoom" set to 0.25 reports a font-size of "36px". I would expect 14px to reported in both cases.
<rdar://problem/30725497>
Issue is minimum font size increased the font back up to 9px, so when we try to reverse engineer the original font size by dividing by the zoom, we get the wrong answer.