▁EC MA Script ▁Standard , ▁and ▁concepts ▁like ▁progress ive ▁enh ancement , ▁grace ful ▁de grad ation ▁and ▁un ob tr us ive ▁script ing . ▁These ▁best ▁practice ▁approaches ▁have ▁been ▁called ▁DOM ▁script ing ▁to ▁differenti ate ▁them ▁from ▁earlier ▁perce ived ▁bad ▁uses ▁of ▁D HTML . ▁The ▁task ▁force ▁became ▁in active ▁before ▁the ▁group ▁dis band ed . ▁ ▁Activ ities ▁▁ ▁The ▁Ac id 1 ▁test ▁allows ▁browsers ▁and ▁other ▁rendering ▁engines ▁to ▁test ▁comp liance ▁with ▁HTML ▁ 4 ▁and ▁CSS ▁ 1 ▁specific ations . ▁ ▁The ▁Ac id 2 ▁test ▁allows ▁browsers ▁and ▁other ▁rendering ▁engines ▁to ▁test ▁comp liance ▁with ▁CSS ▁ 1 ▁and ▁ 2 ▁specific ations . ▁ ▁The ▁Ac id 3 ▁test ▁allows ▁browsers ▁and ▁other ▁rendering ▁engines ▁to ▁test ▁comp liance ▁with ▁CSS ▁ 2 . 1 , ▁DOM , ▁and ▁E c ma Script ▁specific ations . ▁ ▁The ▁Ac id 4 ▁test , ▁to ▁be ▁created ▁at ▁a ▁later ▁date , ▁will ▁allow ▁browsers ▁and ▁other ▁rendering ▁engines ▁to ▁test ▁comp liance ▁with ▁SV G , ▁CSS ▁ 3 , ▁and ▁mixed ▁names paces . ▁In ▁the ▁w ake ▁of ▁the ▁Wa SP ' s ▁closure , ▁the ▁status ▁of ▁this ▁test ▁is ▁unknown . ▁ ▁See ▁also ▁ ▁A ▁List ▁A part ▁Brow se ▁Happy ▁Web Platform ▁ ▁References ▁ ▁External ▁links ▁ ▁The ▁Web ▁Stand ards ▁Project ▁Education ▁Task ▁Force ▁Archive : ▁The ▁Web ▁Stand ards ▁Project ' s ▁bas eline ▁standards ▁proposal ▁Archive