BrowserVersionOwn?TypeAs String
Chrome86.0.4240ownfunctionfunction CSSConditionRule() { [native code] }
Edge86.0.622ownfunctionfunction CSSConditionRule() { [native code] }
Edge87.0.651???
Edge87.0.658ownfunctionfunction CSSConditionRule() { [native code] }
Firefox68.0.0???
Firefox79.0.0ownfunctionfunction CSSConditionRule() { [native code] }
IE10.0.0???
Safari10.1.2???

PropertiesChromeEdgeFirefoxIESafari
CHARSET_RULE 86.0.4240 86.0.622 79.0.0??
COUNTER_STYLE_RULE?? 79.0.0??
FONT_FACE_RULE 86.0.4240 86.0.622 79.0.0??
FONT_FEATURE_VALUES_RULE?? 79.0.0??
IMPORT_RULE 86.0.4240 86.0.622 79.0.0??
KEYFRAMES_RULE 86.0.4240 86.0.622 79.0.0??
KEYFRAME_RULE 86.0.4240 86.0.622 79.0.0??
length 86.0.4240 86.0.622 79.0.0??
MEDIA_RULE 86.0.4240 86.0.622 79.0.0??
NAMESPACE_RULE 86.0.4240 86.0.622 79.0.0??
PAGE_RULE 86.0.4240 86.0.622 79.0.0??
prototype 86.0.4240 86.0.622 79.0.0??
STYLE_RULE 86.0.4240 86.0.622 79.0.0??
SUPPORTS_RULE 86.0.4240 86.0.622 79.0.0??