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

actualBoundingBoxAscent · WebPlatform Docs

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

Property of apis/canvas/TextMetricsapis/canvas/TextMetrics

Note: This property is read-only.

var result = TextMetrics.actualBoundingBoxAscent;

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("actualBoundingBoxAscent: " + mets.actualBoundingBoxAscent);

</script>

W3C HTML Canvas 2D Specification

W3C Candidate Recommendation

• Microsoft Developer Network: Windows Internet Explorer API reference Article

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