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.
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.
js
const canvas = document.createElement("canvas"); const ctx = canvas.getContext("2d"); const text = ctx.measureText("foo"); // returns TextMetrics object text.emHeightAscent; // 7.59765625;
| Specification |
|---|
| HTML Standard # dom-textmetrics-emheightascent-dev |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
emHeightAscent |
77 | 79 | 118 | No | 64 | 11.1 | No | 77 | 118 | No | 11.3 | No |
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https://developer.mozilla.org/en-US/docs/Web/API/TextMetrics/emHeightAscent