JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/webfont/1.6.26/webfont.js"></script>

<div id='bucket'></div>
<p>Embedded: <span class="symbol">&#x263C; &#x263D;</span></p>
<div id='container'></div>

CSS

@font-face {
  font-family: 'sunmoon';
  src:...

JavaScript

var symbols = document.createElement('div');
symbols.innerHTML = '<p>Added: <span class="symbol">\u263C \u263D</span></p>';
document.getElementById('bucket').appendChild(symbols);

WebFont.load({
		google: {
	    families: ['Fresca:400']
  	}
});

Highcharts.chart('container', {

    title: {
    		// useHTML: true,
        text: 'In highcharts: <span class="symbol">\u263C \u263D</span>'
    },

    chart: {
        style: {
            fontFamily: 'Fresca'
        }
    },

    xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
            'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'
        ]
    },

    series: [{
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4],
        type: 'column'
    }]

});