Microsoft browsers (Internet Explorer, and in a few cases, Microsoft Edge) support a number of special Microsoft extensions to the otherwise standard DOM APIs. These extensions are prefixed with MS or ms.
Note: These APIs will only work in Microsoft applications, and are not on a standards track.
HTMLVideoElement.msFrameStep()HTMLVideoElement.msHorizontalMirrorHTMLVideoElement.msInsertVideoEffect()HTMLVideoElement.msIsLayoutOptimalForPlaybackHTMLVideoElement.msIsStereo3DHTMLVideoElement.msZoomHTMLAudioElement.msAudioCategoryHTMLAudioElement.msAudioDeviceTypeHTMLMediaElement.msClearEffects()HTMLMediaElement.msInsertAudioEffect()MediaError.msExtendedCodeMSGraphicsTrustmsGraphicsTrustStatusmsIsBoxedmsPlayToDisabledmsPlayToPreferredSourceUrimsPlayToPrimarymsPlayToSourcemsRealTimemsSetMediaProtectionManagermsSetVideoRectanglemsStereo3DPackingModemsStereo3DRenderModeonMSVideoFormatChangedonMSVideoFrameStepCompletedonMSVideoOptimalLayoutChangedmsFirstPaintx-ms-aria-flowfromx-ms-acceleratorkeyx-ms-format-detectionmsCachingmsCachingEnabledmsCapsLockWarningOffEvent.msConvertURL()mselementresizeDocument.msElementsFromRect()msIsStaticHTMLNavigator.msLaunchUri()msLaunchUriCallbackElement.msMatchesSelector()
msProtocolsmsPutPropertyEnabledmsWriteProfilerMark
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https://developer.mozilla.org/en-US/docs/Web/API/Microsoft_Extensions