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

actualBoundingBoxDescent ยท WebPlatform Docs

actualBoundingBoxDescent Summary

The distance from the horizontal line indicated by the textBaseline attribute to the bottom of the bounding rectangle of the given text, in CSS pixels; positive numbers indicating a distance going down from the given baseline.

Property of apis/canvas/TextMetricsapis/canvas/TextMetrics

Syntax

Note: This property is read-only.

var result = TextMetrics.actualBoundingBoxDescent;
Return Value

Returns an object of type NumberNumber

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

</script>
Related specifications
W3C HTML Canvas 2D Specification
W3C Candidate Recommendation
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