source: node_modules/prismjs/plugins/unescaped-markup/prism-unescaped-markup.js

(function () {

        if (typeof Prism === 'undefined' || typeof document === 'undefined') {
                return;
        }

        // https://developer.mozilla.org/en-US/docs/Web/API/Element/matches#Polyfill
        if (!Element.prototype.matches) {
                Element.prototype.matches = Element.prototype.msMatchesSelector || Element.prototype.webkitMatchesSelector;
        }


        Prism.plugins.UnescapedMarkup = true;

        Prism.hooks.add('before-highlightall', function (env) {
                env.selector += ', [class*="lang-"] script[type="text/plain"]'
                        + ', [class*="language-"] script[type="text/plain"]'
                        + ', script[type="text/plain"][class*="lang-"]'
                        + ', script[type="text/plain"][class*="language-"]';
        });

        Prism.hooks.add('before-sanity-check', function (env) {
                /** @type {HTMLElement} */
                var element = env.element;

                if (element.matches('script[type="text/plain"]')) {
                        // found a <script type="text/plain" ...> element
                        // we convert this element to a regular <pre><code> code block

                        var code = document.createElement('code');
                        var pre = document.createElement('pre');

                        // copy class name
                        pre.className = code.className = element.className;

                        // copy all "data-" attributes
                        var dataset = element.dataset;
                        Object.keys(dataset || {}).forEach(function (key) {
                                if (Object.prototype.hasOwnProperty.call(dataset, key)) {
                                        pre.dataset[key] = dataset[key];
                                }
                        });

                        code.textContent = env.code = env.code.replace(/&lt;\/script(?:>|&gt;)/gi, '</scri' + 'pt>');

                        // change DOM
                        pre.appendChild(code);
                        element.parentNode.replaceChild(pre, element);
                        env.element = code;
                        return;
                }

                if (!env.code) {
                        // no code
                        var childNodes = element.childNodes;
                        if (childNodes.length === 1 && childNodes[0].nodeName == '#comment') {
                                // the only child is a comment -> use the comment's text
                                element.textContent = env.code = childNodes[0].textContent;
                        }
                }
        });
}());