The CSS Object Model is a set of APIs allowing to manipulate CSS from JavaScript. It is the pendant of DOM and HTML APIs, but for CSS. It allows to read and modify CSS style dynamically.
AnimationEventCaretPositionCSSCSSCharsetRuleCSSConditionRuleCSSCounterStyleRuleCSSFontFaceRuleCSSFontFeatureValuesMapCSSFontFeatureValuesRuleCSSGroupingRuleCSSImportRuleCSSKeyframeRuleCSSKeyframesRuleCSSMarginRuleCSSMediaRuleCSSNamespaceRuleCSSPageRuleCSSRuleCSSRuleListCSSStyleSheetCSSStyleDeclarationCSSSupportsRuleCSSVariablesMapCSSViewportRuleElementCSSInlineStyleGeometryUtilsGetStyleUtilsLinkStyleMediaListMediaQueryListPseudoElementScreenStyleSheetStyleSheetListTransitionEventSeveral other interfaces are also extended by the CSSOM-related specifications: Document, Window, Element, HTMLElement, HTMLImageElement, Range, MouseEvent, and SVGElement.
| Specification | Status | Comment |
|---|---|---|
| CSS Object Model (CSSOM) | Working Draft | |
| CSS Object Model (CSSOM) View Module | Working Draft | |
| Screen Orientation API | Working Draft | |
| CSS Fonts Module Level 3 | Candidate Recommendation | |
| CSS Animations | Working Draft | |
| CSS Transitions | Working Draft | |
| CSS Custom Properties for Cascading Variables Module Level 1 | Working Draft | |
| CSS Conditional Rules Module Level 3 | Candidate Recommendation | |
| CSS Device Adaptation | Working Draft | |
| CSS Counter Styles Level 3 | Candidate Recommendation |
All these features have been added little by little over the years to the different browsers: it was a quite complex process that can't be summarized in a simple table. Please refer to the specific interfaces for its availability.
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https://developer.mozilla.org/en-US/docs/Web/API/CSS_Object_Model