The read-only actualBoundingBoxAscent property of the TextMetrics interface is a double giving the distance from the horizontal line indicated by the CanvasRenderingContext2D.textBaseline attribute to the top of the bounding rectangle used to render the text, in CSS pixels.
js
const canvas = document.createElement("canvas"); const ctx = canvas.getContext("2d"); const text = ctx.measureText("foo"); // returns TextMetrics object text.actualBoundingBoxAscent; // 8;
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
actualBoundingBoxAscent |
77 | 79 | 74 | No | 64 | 11.1 | 77 | 77 | 79 | 55 | 11.3 | 12.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/TextMetrics/actualBoundingBoxAscent