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Using CSS classes and styles
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<iframe 
    src="https://jsxgraph.uni-bayreuth.de/share/iframe/using-css-styles" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: Using CSS classes and styles" 
    allowfullscreen
></iframe>
This code has to 
<style>
    .myFont {
        text-decoration: underline;
    }

    .myDefaultFont: {
        font-family: monospace;
    }

    .myFontHigh {
        font-weight: bold;
        border: 1px solid black;
    }

    .myFontHigh span {
        font-size: 150%;
    }
</style>

<div id="board-0-wrapper" class="jxgbox-wrapper " style="width: 100%; ">
   <div id="board-0" class="jxgbox" style="aspect-ratio: 1 / 1; width: 100%;" data-ar="1 / 1"></div>
</div>

<script type = "text/javascript"> 
    /*
    This example is licensed under a 
    Creative Commons Attribution ShareAlike 4.0 International License.
    https://creativecommons.org/licenses/by-sa/4.0/
    
    Please note you have to mention 
    The Center of Mobile Learning with Digital Technology
    in the credits.
    */
    
    const BOARDID = 'board-0';

    JXG.Options.text.cssDefaultStyle = '';
    JXG.Options.text.highlightCssDefaultStyle = '';
    JXG.Options.text.cssClass = 'myDefaultFont';
    
    var board = JXG.JSXGraph.initBoard(BOARDID, {
        boundingbox: [-3, 3, 3, -3]
    });
    
    var txt = board.create('text', [0, 1, " <span id='par'>(</span> Hello world <span id='par'>)</span>"],
    {
        cssClass: 'myFont',
        strokeColor: 'red',
        highlightCssClass: 'myFontHigh',
        fontSize: 20
    });
    
    var p = board.create('point', [0, 0], {
        name: 'AiX'
    });
 </script> 
/*
This example is licensed under a 
Creative Commons Attribution ShareAlike 4.0 International License.
https://creativecommons.org/licenses/by-sa/4.0/

Please note you have to mention 
The Center of Mobile Learning with Digital Technology
in the credits.
*/

const BOARDID = 'your_div_id'; // Insert your id here!

JXG.Options.text.cssDefaultStyle = '';
JXG.Options.text.highlightCssDefaultStyle = '';
JXG.Options.text.cssClass = 'myDefaultFont';

var board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-3, 3, 3, -3]
});

var txt = board.create('text', [0, 1, " <span id='par'>(</span> Hello world <span id='par'>)</span>"],
{
    cssClass: 'myFont',
    strokeColor: 'red',
    highlightCssClass: 'myFontHigh',
    fontSize: 20
});

var p = board.create('point', [0, 0], {
    name: 'AiX'
});
It is possible to supply CSS classes to JSXGrap elements. This is especially useful for texts. A CSS class can be used as default text style by setting __before__ the call of `initBoard()` and is defined for *all* boards of that web page. ```javascript JXG.Options.text.cssClass = 'myDefaultFont'; ``` After `initBoard()` has been called the default class for a specific board may be changed by calling ```javascript board.options.text.cssClass = 'myDefaultFont'; ``` Highlighted text uses the CSS class highlightCssClass. ```javascript JXG.Options.text.highlightCssClass = 'myDefaultFont'; ``` As with all JSXGraph options, CSS class can also be set while creating a text element. See the example below. __Attention:__ The CSS properties color and font-size may be overwritten by the JSXGraph properties `strokeWidth` and `fontSize`.
<style>
    .myFont {
        text-decoration: underline;
    }

    .myDefaultFont: {
        font-family: monospace;
    }

    .myFontHigh {
        font-weight: bold;
        border: 1px solid black;
    }

    .myFontHigh span {
        font-size: 150%;
    }
</style>
// Define the id of your board in BOARDID

JXG.Options.text.cssDefaultStyle = '';
JXG.Options.text.highlightCssDefaultStyle = '';
JXG.Options.text.cssClass = 'myDefaultFont';

var board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-3, 3, 3, -3]
});

var txt = board.create('text', [0, 1, " <span id='par'>(</span> Hello world <span id='par'>)</span>"],
{
    cssClass: 'myFont',
    strokeColor: 'red',
    highlightCssClass: 'myFontHigh',
    fontSize: 20
});

var p = board.create('point', [0, 0], {
    name: 'AiX'
});

license

This example is licensed under a Creative Commons Attribution ShareAlike 4.0 International License.
Please note you have to mention The Center of Mobile Learning with Digital Technology in the credits.