Adam Colvin 1916b6cfc1 LibWeb: Match nth-child pseudo-classes on elements without a parent ...

The :nth-child(), :nth-last-child(), :nth-of-type(), and
:nth-last-of-type() pseudo-classes previously returned false for
elements that have no parent node. This meant that calling
element.matches(":nth-child(1)") on a standalone element created
via document.createElement() would incorrectly return false.

An element without a parent has no siblings, so its index is 1. The
simpler child-indexed pseudo-classes (:first-child, :last-child, etc.)
already handled this case correctly by checking for sibling presence
without requiring a parent. This change brings the nth-* variants in
line with that behavior by guarding the sibling iteration loops on
parent existence rather than returning false early.

2026-03-10 09:58:54 +00:00

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