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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/TextMetrics/fontBoundingBoxDescent below:

TextMetrics: fontBoundingBoxDescent property - Web APIs

Baseline 2023

Newly available

Note: This feature is available in Web Workers.

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.

A number, in CSS pixels.

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

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

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

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

const log = document.getElementById("log");
log.innerText = `fontBoundingBoxDescent: ${descentCssPixels}`;

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

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