After we updated our iPhones to iOS 13.4, we found that Apple introduced a bug in the rendering of boxes with specific CSS properties for the
After we found the problem on some websites, we created a new Codepen to isolate and identify the problem. Here’s what we found out.
TL;DR: A black bar appears when applying a
box-shadow rule with an
inset value and a large negative
spread-radius is the fourth length value. Positive values will cause the shadow to expand…