The read-only emHeightAscent property of the TextMetrics interface is a double giving 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.
TextMetrics.emHeightAscent
Examples
const canvas = document.createElement('canvas'); const ctx = canvas.getContext('2d'); const text = ctx.measureText('foo'); // returns TextMetrics object text.emHeightAscent; // 7.59765625;
Specifications
| Specification |
|---|
| HTML Standard # dom-textmetrics-emheightascent-dev |
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
emHeightAscent |
35
|
79
|
74
|
No
|
No
|
11.1
|
No
|
35
|
No
|
No
|
11.3
|
No
|
See also
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/TextMetrics/emHeightAscent
