问试图将Motoko片段添加到edX页面，并且只解析该HTML

EN

    <div id="counter" class="listingblock">
<div class="content">
<pre class="highlightjs highlight"><code class="language-motoko hljs" data-lang="motoko">actor Counter {
​
  var value = 0;
​
  public func inc() : async Nat {
    value += 1;
    return value;
  };
}</code></pre>
</div>
</div>
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​
<!-- Start of dfinity Zendesk Widget script -->
<script id="ze-snippet" src="https://static.zdassets.com/ekr/snippet.js?key=53121947-c10a-484c-b99b-f89a9fb6f63e"> </script>
<!-- End of dfinity Zendesk Widget script -->
<script async type="text/javascript" src="https://courses.edx.org/asset-v1:DFINITY+IC001+3T2021a+type@asset+block@behavior.js"></script>
<script async type="text/javascript" src="https://courses.edx.org/asset-v1:DFINITY+IC001+3T2021a+type@asset+block@highlight.bundle.js"></script>
​
<script type="text/javascript" src="https://courses.edx.org/asset-v1:DFINITY+IC001+3T2021a+type@asset+block@run_repl.js"></script>
​
<script type="module">
  import {CodeJar} from 'https://cdn.jsdelivr.net/npm/codejar@3.2.3/codejar.min.js';
  import {withLineNumbers} from 'https://cdn.jsdelivr.net/npm/codejar@3.2.3/linenumbers.js';
  window.CodeJar = CodeJar;
  window.withLineNumbers = withLineNumbers;
</script> 
<script type="module">
  import {CodeJar} from 'https://medv.io/codejar/codejar.js'
</script>
<script type="text/javascript">
async function addPackage(name, repo, version, dir) {
  const meta_url = `https://data.jsdelivr.com/v1/package/gh/${repo}@${version}/flat`;
  const base_url = `https://cdn.jsdelivr.net/gh/${repo}@${version}`;
  const response = await fetch(meta_url);
  const json = await response.json()
  const promises = [];
  const fetchedFiles = [];
  for (const f of json.files) {
    if (f.name.startsWith(`/${dir}/`) && /\.mo$/.test(f.name)) {
      const promise = (async () => {
        const content = await (await fetch(base_url + f.name)).text();
        const stripped = name + f.name.slice(dir.length + 1);
        fetchedFiles.push(stripped);
        Motoko.saveFile(stripped, content);
      })();
      promises.push(promise);
    }
  }
  Promise.all(promises).then(() => {
    Motoko.addPackage(name, name + '/');
    console.log(`Loaded motoko library "${name}"`);
    changeCodeBlock(); // from run_repl.js
  });
}
function loadBase() {
  addPackage('base', 'dfinity/motoko-base', 'dfx-0.8.4', 'src');
}
</script>
​
<script async src="https://courses.edx.org/asset-v1:DFINITY+IC001+3T2021a+type@asset+block@moc-interpreter-0.6.20.js" onload="loadBase()"></script>