Affected: npm: highcharts

### Impact When the HTML text parser cannot obtain a document from `DOMParser` because the call throws, it falls back to assigning the raw markup to the `innerHTML` of an element created in the hosting document, and the allow-list is applied only to the resulting DOM afterwards. In Chromium the Trusted Types policy callback that the parser uses throws while a `beforeprint` handler is running, so if the hosting page re-renders the chart from a `beforeprint` handler, every HTML-rendered text option parsed at that moment, such as `useHTML` titles, axis labels and data labels or text set by responsive rules, is inserted unsanitized, and event handlers embedded in that markup run in the origin of the page hosting the chart. Exploitation requires that untrusted data reach the chart configuration, that the hosting page update the chart from a `beforeprint` handler in Chromium, and that printing be started, which the print item of the exporting menu does on its own. Charts built with Highcharts Stock, Maps and Gantt are included, since those ship from the same package as Core.

### Workarounds **Drop-in fix - for any versions affected (12.0.0-13.0.2).** Add the below IIFE to run after Highcharts is loaded. ``` ((n)=>{n.AST.prototype.parseMarkup=function parseMarkup(t){let e,i=[];t=t.trim().replace(/ style=(["'])/g," data-style=$1");try{e=new DOMParser().parseFromString(tI?tI.createHTML(t):t,"text/html")}catch{}if(!e)try{e=new DOMParser().parseFromString(t,"text/html")}catch{}e||((e…