The HTMLObjectElement.typeMustMatch property is a Boolean that reflects the typemustmatch attribute of the <object> element. It indicates if the resource linked by it must match the MIME type given by HTMLObjectElement.type in order for this resource to be used.


var mustMatch = obj.typeMustMatch;
obj.typeMustMatch = mustMatch;



<object id="obj" data="move.swf" type="application/x-shockwave-flash" typemustmatch></object>


let obj = document.getElementById('obj');


Specification Status Comment
HTML Living Standard
The definition of 'HTMLObjectElement' in that specification.
Living Standard No change from HTML5, the latest snaspshot of the WHATWG specification.
The definition of 'HTMLObjectElement' in that specification.
Recommendation The W3C specification is a latest of a previous version of HTML Living Standard
First snapshot with this property.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
typeMustMatchChrome No support NoEdge No support NoFirefox Full support 27IE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoFirefox Android Full support 27Opera Android No support NoSafari iOS No support NoSamsung Internet Android ?


Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

  • The HTML element implementing this interface and this property: <object>.

Document Tags and Contributors

Last updated by: jpmedley,