CanvasRenderingContext2D.textBaseline

The CanvasRenderingContext2D.textBaseline property of the Canvas 2D API specifies the current text baseline being used when drawing text.

Syntax

ctx.textBaseline = "top" || "hanging" || "middle" || "alphabetic" || "ideographic" || "bottom";

Options

Possible values:

top
The text baseline is the top of the em square.
hanging
The text baseline is the hanging baseline. (Used by Tibetan and other Indic scripts.)
middle
The text baseline is the middle of the em square.
alphabetic (default value)
The text baseline is the normal alphabetic baseline.
ideographic
The text baseline is the ideographic baseline; this is the bottom of the body of the characters, if the main body of characters protrudes beneath the alphabetic baseline. (Used by Chinese, Japanese and Korean scripts.)
bottom
The text baseline is the bottom of the bounding box. This differs from the ideographic baseline in that the ideographic baseline doesn't consider descenders.

The default value is alphabetic.

Examples

Using the textBaseline property

This demonstrates the different textBaseline property values.

HTML

<canvas id="canvas" width="550" height="500"></canvas>

JavaScript

var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');

var baselines = ['top', 'hanging', 'middle', 'alphabetic', 'ideographic', 'bottom'];
ctx.font = '36px serif';
ctx.strokeStyle = 'red';

baselines.forEach(function (baseline, index) {
    ctx.textBaseline = baseline;
    var y = 75 + index * 75;
    ctx.beginPath(); ctx.moveTo(0, y + 0.5); ctx.lineTo(550, y + 0.5); ctx.stroke();
    ctx.fillText('Abcdefghijklmnop (' + baseline + ')', 0, y);
});

Edit the code below and see your changes update live in the canvas:

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'CanvasRenderingContext2D.textBaseline' in that specification.
Living Standard  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes123.59 Yes Yes
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes4 Yes Yes Yes

See also

Document Tags and Contributors

Contributors to this page: fscholz, RexHsu, zbjornson, nmve, erikadoyle, Dmandelin
Last updated by: fscholz,