Limited availability
Note: This feature is available in Web Workers.
The read-only emHeightAscent property of the TextMetrics interface returns the distance from the horizontal line indicated by the CanvasRenderingContext2D.textBaseline property to the top of the em square in the line box, in CSS pixels.
A number, in CSS pixels.
Examplesconst canvas = document.createElement("canvas");
const ctx = canvas.getContext("2d");
const text = ctx.measureText("foo"); // returns TextMetrics object
text.emHeightAscent; // 7.59765625;
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