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TextMetrics: fontBoundingBoxDescent property

The read-only fontBoundingBoxDescent property of the TextMetrics interface returns the distance from the horizontal line indicated by the CanvasRenderingContext2D.textBaseline attribute to the bottom of the bounding rectangle of all the fonts used to render the text, in CSS pixels.

Value

A number, in CSS pixels.

Examples

The code below shows how you can get the fontBoundingBoxDescent for text in a particular font.

js

const canvas = document.createElement("canvas");
const ctx = canvas.getContext("2d");

ctx.font = "25px serif";
const text = "Foo";

const textMetrics = ctx.measureText("foo"); // returns TextMetrics object
const descentCssPixels = textMetrics.fontBoundingBoxDescent;

The descent in CSS pixels for the text "Foo" in a 25px serif font is shown below.

Specifications

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
fontBoundingBoxDescent 87 87 116 No 73 11.1 87 87 116 62 11.3 14.0

See also

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https://developer.mozilla.org/en-US/docs/Web/API/TextMetrics/fontBoundingBoxDescent