I didn't find any statement on default values for style properties of ::highlight in the [spec draft](https://drafts.csswg.org/css-highlight-api-1/). There are some default values in the [spec for pseudos](https://drafts.csswg.org/css-pseudo-4/#highlight-ua-styles ) but ::highlight is not in the list. Also in the [spec draft of ::highlight](https://drafts.csswg.org/css-highlight-api-1/) there's no mention of it. Should it use no visual effects or should it use for example [Highlight/HighlightText](https://source.chromium.org/chromium/src/+/main:third_party/blink/renderer/core/layout/layout_theme.cc;l=593;drc=c06511a314747fab345af58b8523eec1b36caf05;bpv=1;bpt=1) colors instead? I assume it's taking no visual effects as default values (as in when background-color is not specified inside a ::highlight(foo) then the content's background is the same as if there was no ::highlight defined), but maybe it should be explicitly stated?