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Showing content from https://webplatform.github.io/docs/apis/canvas/TextMetrics/emHeightDescent below:

emHeightDescent · WebPlatform Docs

The distance from the horizontal line indicated by the textBaseline attribute to the bottom of the em square in the line box, in CSS pixels; positive numbers indicating that the given baseline is below the bottom of the em square (so this value will usually be negative). (Zero if the given baseline is the top of the em square.)

Property of apis/canvas/TextMetricsapis/canvas/TextMetrics

Note: This property is read-only.

var result = TextMetrics.emHeightDescent;

Returns an object of type NumberNumber

<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.font = "24px Arial";
var txt = "Hello world!"
ctxt.fillText(txt, 10, 75);
var mets = ctxt.measureText(txt);
alert("emHeightDescent: " + mets.emHeightDescent);

</script>

W3C HTML Canvas 2D Specification

W3C Candidate Recommendation

• Microsoft Developer Network: Windows Internet Explorer API reference Article

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