v151 · css · anchor-positioning

Anchor Default Behavior

Two tooltips, each anchored to a button. The left relies purely on the normal default (no position-anchor declared); the right explicitly sets position-anchor: auto. Both should anchor correctly because normal resolves to auto when position-area is set.

Implicit — relies on `normal` default (no `position-anchor` set)

Tooltip using position-area — no position-anchor declared, relies on the normal initial

Explicit — `position-anchor: --btn-b` (for comparison)

Tooltip using position-area + explicit position-anchor

The computed position-anchor value will show whether normal is the resolved initial.

references

ChromeStatus entry
CSS Anchor Positioning spec

implementation reference

Need the exact API surface, compatibility boundaries, errors, lifecycle, and source links? Read the matching gendn reference ↗

Implicit — relies on normal default (no position-anchor set)

Explicit — position-anchor: --btn-b (for comparison)

references

implementation reference

Implicit — relies on `normal` default (no `position-anchor` set)

Explicit — `position-anchor: --btn-b` (for comparison)