This reverts commit51ac0ce5a6. Revert "Bug 1924567 - Remove unobservable-document constraints from plaintext layout styles. r=firefox-style-system-reviewers,emilio" This reverts commit6f07be8781.
This reverts commit51ac0ce5a6. Revert "Bug 1924567 - Remove unobservable-document constraints from plaintext layout styles. r=firefox-style-system-reviewers,emilio" This reverts commit6f07be8781.