Hi, I'd like to request an official position of WebKit on changing the default ' display' property value of <summary> to 'list-item', and the relevant changes below: - Add 'disclosure-closed' and 'disclosure-open' keywords to ' list-style-type' property - Add ::marker pseudo element selector support to <summary> - Remove ::-webkit-details-marker pseudo element selector [1] is the usage counter for ::-webkit-details-marker, and it shows the ratio of pages with elements matched to ::-webkit-details-marker in author stylesheets. Currently the ratio is 0.0%. Firefox already shipped all of them. Specification: https://html.spec.whatwg.org/C/#the-details-and-summary-elements Specification: https://drafts.csswg.org/css-counter-styles-3/#disclosure-open [1] https://chromestatus.com/metrics/feature/timeline/popularity/3337 -- TAMURA Kent Software Engineer, Google