TextMetrics: emHeightAscent property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

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.

Value

A number, in CSS pixels.

Examples

js
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
# dom-textmetrics-emheightascent-dev

Browser compatibility

See also