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

textAlign · WebPlatform Docs

textAlign Summary

Returns or sets the text alignment value. See return value description below.

Property of apis/canvas/CanvasRenderingContext2Dapis/canvas/CanvasRenderingContext2D

Syntax
var result = CanvasRenderingContext2D.textAlign;
CanvasRenderingContext2D.textAlign = value;
Return Value

Returns an object of type StringString

Must be one of the following:

Examples
<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.strokeStyle="green";
ctxt.moveTo(150,0);
ctxt.lineTo(150,150);
ctxt.stroke();

ctxt.font="16px Arial";

ctxt.textAlign="start";
ctxt.fillText("START",150,40);
ctxt.textAlign="end";
ctxt.fillText("END",150,60);
ctxt.textAlign="left";
ctxt.fillText("LEFT",150,80);
ctxt.textAlign="right";
ctxt.fillText("RIGHT",150,100);
ctxt.textAlign="center";
ctxt.fillText("CENTER",150,120);
</script>
Notes

The exact alignment depends on whether the direction of HTMLCanvasElement is left-to-right (ltr) or right-to-left (rtl). The textBaseline value also determines the anchor point of the text.

Related specifications
W3C HTML Canvas 2D Specification
W3C Candidate Recommendation
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