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Showing content from https://webplatform.github.io/docs/apis/canvas/CanvasRenderingContext2D/removeHitRegion below:

removeHitRegion · WebPlatform Docs

Removes a previously-defined hit region.

Method of apis/canvas/CanvasRenderingContext2Dapis/canvas/CanvasRenderingContext2D

 object.removeHitRegion(options);

Data-type

String

This parameter is of type HitRegionOptions. See Related Specifications for details.

No return value

<canvas id="myCanvas" width="300" height="150" style="border:1px solid blue;"></canvas>
<p>. . .</p>
<script>
var can = document.getElementById( "myCanvas" );
var ctxt = can.getContext( "2d" );
ctxt.fillStyle = "lime";
ctxt.beginPath( );
ctxt.rect( 10, 10, 100, 100 );
ctxt.fill( );
try {
    ctxt.addHitRegion( {"id": "limeRectangle" } );
} catch( e ) {
    alert( "your browser does not support hit regions" );
}
try {
    ctxt.removeHitRegion( {"id": "limeRectangle" } );
} catch( e ) {
    alert( "your browser does not support hit regions" );
}
</script>

A hit region is an arbitrary rectangular area on the canvas that responds to user events, with the goal of simplifying event detection.

W3C HTML Canvas 2D Specification

W3C Candidate Recommendation

• Microsoft Developer Network: Article

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