This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
msZoom is a read/write property which gets or sets
whether the video frame is trimmed, on the top and bottom or left and right, to fit the
This proprietary property is specific to Internet Explorer and Microsoft Edge.
Boolean value set to true trims the video frame to the display space. Set to false the video frame uses letter box or pillarbox to display video.
If the native aspect ratio of a video frame, which is defined by the
videoHeight attributes, does not match the
aspect ratio of the
Video tag, which is defined by the width and height
attributes, the video is rendered with letterbox or pillarbox format. Letterbox and
pillarbox are the black bars on either the left and right of the video or the top and
bottom of the video.
msZoom attribute is set to true, the rendered video is
trimmed to fit the dimensions of the video object. Either the top and bottom of the
video is trimmed or the left and right of the video is trimmed.
For instance, if the layout space for the video tag is a 4:3 aspect ratio, but the
stream coming in is in 16:9 aspect ratio, the
msZoom option can be used to
render the 16:9 video in 4:3 aspect ratio. The rendered video will then take up the full
space of the video object.
This examples gets a Video object and sets the
msZoom property to true.
var myVideo = document.getElementById("videoTag1"); myVideo.msZoom = true; myVideo.play();