Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Non-standard: 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.

The DataTransfer.mozUserCancelled property is used in the dragend event handler to determine if the user canceled the drag or not. If the user canceled the event, the property returns true and returns false otherwise. This property only applies to the dragend event.

Note: This property is Firefox-specific.

This property is Read only .


A boolean value representing true if the user canceled the drag event and returns false otherwise.


This example shows the use of the mozUserCancelled property in the dragend event handler.

function dragend_handler(event)
  const dragData = event.dataTransfer;
  console.log(`mozUserCancelled = ${dragData.mozUserCancelled}`);


This property is not defined in any Web standard.

Browser compatibility

BCD tables only load in the browser

See also