TextMetrics: actualBoundingBoxAscent property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2020.

Note: This feature is available in Web Workers.

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.

Examples

js
const canvas = document.createElement("canvas");
const ctx = canvas.getContext("2d");
const text = ctx.measureText("foo"); // returns TextMetrics object
text.actualBoundingBoxAscent; // 8;

Specifications

Specification
HTML
# dom-textmetrics-actualboundingboxascent-dev

Browser compatibility

See also