The read-only fontBoundingBoxAscent
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 highest bounding rectangle of all the fonts used to render the text, in CSS pixels.
Examples
const canvas = document.createElement('canvas'); const ctx = canvas.getContext('2d'); const text = ctx.measureText('foo'); // returns TextMetrics object text.fontBoundingBoxAscent; // 10;
Specifications
Specification |
---|
HTML Living Standard The definition of 'TextMetrics.fontBoundingBoxAscent' in that specification. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
fontBoundingBoxAscent | Chrome
Full support
Yes
| Edge
Full support
79
| Firefox
Full support
74
| IE No support No | Opera ? | Safari Full support Yes | WebView Android No support No | Chrome Android
Full support
Yes
| Firefox Android No support No | Opera Android ? | Safari iOS Full support Yes | Samsung Internet Android No support No |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Experimental. Expect behavior to change in the future.
- Experimental. Expect behavior to change in the future.
- User must explicitly enable this feature.
- User must explicitly enable this feature.