BrowserVersionOwn?TypeAs String
Chrome85.0.4183???
Edge86.0.622???
Firefox68.0.0???
IE10.0.0???
Safari10.1.2ownfunctionfunction WebKitCSSRegionRule() { [native code] }
Safari12.0.0???

PropertiesChromeEdgeFirefoxIESafari
CHARSET_RULE???? 10.0.0
FONT_FACE_RULE???? 10.0.0
IMPORT_RULE???? 10.0.0
KEYFRAMES_RULE???? 10.0.0
KEYFRAME_RULE???? 10.0.0
length???? 10.0.0
MEDIA_RULE???? 10.0.0
NAMESPACE_RULE???? 10.0.0
PAGE_RULE???? 10.0.0
prototype???? 10.0.0
STYLE_RULE???? 10.0.0
SUPPORTS_RULE???? 10.0.0
UNKNOWN_RULE???? 10.0.0
WEBKIT_KEYFRAMES_RULE???? 10.0.0
WEBKIT_KEYFRAME_RULE???? 10.0.0
WEBKIT_REGION_RULE???? 10.0.0