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

fontBoundingBoxAscent · WebPlatform Docs

The distance from the horizontal line indicated by the textBaseline attribute to the top of the highest bounding rectangle of all the fonts used to render the 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.fontBoundingBoxAscent;

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("fontBoundingBoxAscent: " + mets.fontBoundingBoxAscent);

</script>

W3C HTML Canvas 2D Specification

W3C Candidate Recommendation

• Microsoft Developer Network: Windows Internet Explorer API reference Article

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