blocks|key|603056|text|好的，下面的代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|603057|function+tidy(html)+{
++++var+d+=+document.createElement('div');
++++d.innerHTML+=+html;
++++return+d.innerHTML;
}|code-block|syntax|javascript|603058|这将最大限度地“纠正”格式错误的HTML。如果这对您有帮助，那么它比尝试验证HTML容易得多。|603059|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<p>Well, this code:</p>

<pre><code>function tidy(html) {
    var d = document.createElement('div');
    d.innerHTML = html;
    return d.innerHTML;
}
</code></pre>

<p>This will "correct" malformed HTML to the best of the browser's ability. If that's helpful to you, it's a lot easier than trying to validate HTML.</p>


blocks|key|387086|text|function+validHTML(html)+{
++var+openingTags,+closingTags;

++html++++++++=+html.replace(/<[%5E>]*\/\s?>/g,+'');++++++//+Remove+all+self+closing+tags
++html++++++++=+html.replace(/<(br%7Chr%7Cimg).*?>/g,+'');++//+Remove+all+<br>,+<hr>,+and+<img>+tags
++openingTags+=+html.match(/<[%5E\/].*?>/g)+%7C%7C+[];++++++++//+Get+remaining+opening+tags
++closingTags+=+html.match(/<\/.%2B?>/g)+%7C%7C+[];+++++++++++//+Get+remaining+closing+tags

++return+openingTags.length+===+closingTags.length+?+true+:+false;
}

var+htmlContent+=+"<p>your+html+content+goes+here</p>"+//+Note:+String+without+any+html+tag+will+consider+as+valid+html+snippet.+If+it’s+not+valid+in+your+case,+in+that+case+you+can+check+opening+tag+count+first.

if(validHTML(htmlContent))+{
++alert('Valid+HTML')
}
else+{
++alert('Invalid+HTML');
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|387087|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>function validHTML(html) {
  var openingTags, closingTags;

  html        = html.replace(/&lt;[^&gt;]*\/\s?&gt;/g, '');      // Remove all self closing tags
  html        = html.replace(/&lt;(br|hr|img).*?&gt;/g, '');  // Remove all &lt;br&gt;, &lt;hr&gt;, and &lt;img&gt; tags
  openingTags = html.match(/&lt;[^\/].*?&gt;/g) || [];        // Get remaining opening tags
  closingTags = html.match(/&lt;\/.+?&gt;/g) || [];           // Get remaining closing tags

  return openingTags.length === closingTags.length ? true : false;
}

var htmlContent = "&lt;p&gt;your html content goes here&lt;/p&gt;" // Note: String without any html tag will consider as valid html snippet. If it’s not valid in your case, in that case you can check opening tag count first.

if(validHTML(htmlContent)) {
  alert('Valid HTML')
}
else {
  alert('Invalid HTML');
}
</code></pre>


blocks|key|387100|text|function+isHTML(str)
{
+var+a+=+document.createElement('div');
+a.innerHTML+=+str;
+for(var+c=+a.ChildNodes,+i+=+c.length;+i--)
+{
++++if+(c[i].nodeType+==+1)+return+true;
+}
return+false;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|387101|祝好运!|unstyled|387102|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>function isHTML(str)
{
 var a = document.createElement('div');
 a.innerHTML = str;
 for(var c= a.ChildNodes, i = c.length; i--)
 {
    if (c[i].nodeType == 1) return true;
 }
return false;
}
</code></pre>

<p>Good Luck!</p>


blocks|key|387164|text|这取决于您使用的js-library。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|387165|node.js+https://www.npmjs.com/package/html-validator的Html验证器|offset|length|387166|用于jQuery+https://api.jquery.com/jquery.parsehtml/的Html验证器|387167|但是，如前所述，使用浏览器来验证损坏的HTML是一个很好的想法：|387168|function+tidy(html)+{
++++var+d+=+document.createElement('div');
++++d.innerHTML+=+html;
++++return+d.innerHTML;
}|code-block|syntax|javascript|387169|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.com/package/html-validator|1|https://api.jquery.com/jquery.parsehtml/^0|0|8|18|0|0|9|14|1|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@$D|10|E|11|1|12]]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@$D|14|E|15|1|16]]|A|$]]|$1|H|3|I|5|6|7|17|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|18|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]|W|$5|R|S|T|A|$U|X]]]]

<p>It depends on js-library which you use.</p>

<p>Html validatod for node.js <a href="https://www.npmjs.com/package/html-validator" rel="nofollow noreferrer">https://www.npmjs.com/package/html-validator</a></p>

<p>Html validator for jQuery <a href="https://api.jquery.com/jquery.parsehtml/" rel="nofollow noreferrer">https://api.jquery.com/jquery.parsehtml/</a></p>

<p>But, as mentioned before, using the browser to validate broken HTML is a great idea:</p>

<pre><code>function tidy(html) {
    var d = document.createElement('div');
    d.innerHTML = html;
    return d.innerHTML;
}
</code></pre>


blocks|key|387216|text|9年后，使用DOMParser怎么样？|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|387217|它接受字符串作为参数并返回Document类型，就像HTML一样。因此，当出现错误时，返回的document对象中包含<parsererror>元素。|style|CODE|387218|如果将html解析为xml，至少可以检查html是否符合xhtml。|387219|示例|387220|>+const+parser+=+new+DOMParser();
>+const+doc+=+parser.parseFromString('<div>Input:+<input+/></div>',+'text/xml');
>+(doc.documentElement.querySelector('parsererror')+%7C%7C+{}).innerText;+//+undefined|code-block|syntax|javascript|387221|将其包装为函数|387222|function+isValidHTML(html)+{
++const+parser+=+new+DOMParser();
++const+doc+=+parser.parseFromString(html,+'text/xml');
++if+(doc.documentElement.querySelector('parsererror'))+{
++++return+doc.documentElement.querySelector('parsererror').innerText;
++}+else+{
++++return+true;
++}
}|387223|测试上述功能|387224|isValidHTML('<a>hell<B>o</B></a>')+//+true
isValidHTML('<a+href="test.html">hell</a>')+//+true
isValidHTML('<a+href='test.html'>hell</a>')+//+true
isValidHTML("<a+href=test.html>hell</a>")++//+This+page+contains+the+following+err..
isValidHTML('<ul><li>a</li><li>b</li></ul>')+//+true
isValidHTML('<ul><li>a<li>b</ul>')+//+This+page+contains+the+following+err..
isValidHTML('<div><input+/></div>'+//+true
isValidHTML('<div><input></div>'+//+This+page+contains+the+following+err..|387225|上面的代码适用于非常简单的html。但是，如果您的html包含一些类似代码的文本；<script>、<style>等，尽管它是有效的HTML，但您只需要对其进行操作即可进行XML验证|387226|下面的代码将类似代码的html更新为有效的XML语法。|387227|export+function+getHtmlError(html)+{
++const+parser+=+new+DOMParser();
++const+htmlForParser+=+`<xml>${html}</xml>`
++++.replace(/(src%7Chref)=".*?&.*?"/g,+'$1="OMITTED"')
++++.replace(/<script[\s\S]%2B?<\/script>/gm,+'<script>OMITTED</script>')
++++.replace(/<style[\s\S]%2B?<\/style>/gm,+'<style>OMITTED</style>')
++++.replace(/<pre[\s\S]%2B?<\/pre>/gm,+'<pre>OMITTED</pre>')
++++.replace(/&nbsp;/g,+'&#160;');

++const+doc+=+parser.parseFromString(htmlForParser,+'text/xml');
++if+(doc.documentElement.querySelector('parsererror'))+{
++++console.error(htmlForParser.split(/\n/).map(+(el,+ndx)+=>+`${ndx%2B1}:+${el}`).join('\n'));
++++return+doc.documentElement.querySelector('parsererror');
++}
}|387228|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.mozilla.org/en-US/docs/Web/API/DOMParser|1|https://developer.mozilla.org/en-US/docs/Web/API/Document^0|6|9|0|0|1N|D|D|8|1|0|0|0|0|0|0|0|0|15|8|1E|7|0|0|0^^$0|@$1|2|3|4|5|6|7|1E|8|@]|9|@$A|1F|B|1G|1|1H]]|C|$]]|$1|D|3|E|5|6|7|1I|8|@$A|1J|B|1K|F|G]]|9|@$A|1L|B|1M|1|1N]]|C|$]]|$1|H|3|I|5|6|7|1O|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|1P|8|@]|9|@]|C|$]]|$1|L|3|M|5|N|7|1Q|8|@]|9|@]|C|$O|P]]|$1|Q|3|R|5|6|7|1R|8|@]|9|@]|C|$]]|$1|S|3|T|5|N|7|1S|8|@]|9|@]|C|$O|P]]|$1|U|3|V|5|6|7|1T|8|@]|9|@]|C|$]]|$1|W|3|X|5|N|7|1U|8|@]|9|@]|C|$O|P]]|$1|Y|3|Z|5|6|7|1V|8|@$A|1W|B|1X|F|G]|$A|1Y|B|1Z|F|G]]|9|@]|C|$]]|$1|10|3|11|5|6|7|20|8|@]|9|@]|C|$]]|$1|12|3|13|5|N|7|21|8|@]|9|@]|C|$O|P]]|$1|14|3|-4|5|6|7|22|8|@]|9|@]|C|$]]]|15|$16|$5|17|18|19|C|$1A|1B]]|1C|$5|17|18|19|C|$1A|1D]]]]

<p>9 years later, how about using <a href="https://developer.mozilla.org/en-US/docs/Web/API/DOMParser" rel="nofollow noreferrer">DOMParser</a>?</p>
<p>It accepts string as parameter and returns <a href="https://developer.mozilla.org/en-US/docs/Web/API/Document" rel="nofollow noreferrer">Document</a> type, just like HTML.
Thus, when it has an error, the returned document object has <code>&lt;parsererror&gt;</code> element in it.</p>
<p>If you parse your html as xml, at least you can check your html is xhtml compliant.</p>
<p>Example</p>
<pre><code>&gt; const parser = new DOMParser();
&gt; const doc = parser.parseFromString('&lt;div&gt;Input: &lt;input /&gt;&lt;/div&gt;', 'text/xml');
&gt; (doc.documentElement.querySelector('parsererror') || {}).innerText; // undefined
</code></pre>
<p>To wrap this as a function</p>
<pre><code>function isValidHTML(html) {
  const parser = new DOMParser();
  const doc = parser.parseFromString(html, 'text/xml');
  if (doc.documentElement.querySelector('parsererror')) {
    return doc.documentElement.querySelector('parsererror').innerText;
  } else {
    return true;
  }
}
</code></pre>
<p>Testing the above function</p>
<pre><code>isValidHTML('&lt;a&gt;hell&lt;B&gt;o&lt;/B&gt;&lt;/a&gt;') // true
isValidHTML('&lt;a href=&quot;test.html&quot;&gt;hell&lt;/a&gt;') // true
isValidHTML('&lt;a href='test.html'&gt;hell&lt;/a&gt;') // true
isValidHTML(&quot;&lt;a href=test.html&gt;hell&lt;/a&gt;&quot;)  // This page contains the following err..
isValidHTML('&lt;ul&gt;&lt;li&gt;a&lt;/li&gt;&lt;li&gt;b&lt;/li&gt;&lt;/ul&gt;') // true
isValidHTML('&lt;ul&gt;&lt;li&gt;a&lt;li&gt;b&lt;/ul&gt;') // This page contains the following err..
isValidHTML('&lt;div&gt;&lt;input /&gt;&lt;/div&gt;' // true
isValidHTML('&lt;div&gt;&lt;input&gt;&lt;/div&gt;' // This page contains the following err..
</code></pre>
<p>The above works for very simple html.
However if your html has some code-like texts; <code>&lt;script&gt;</code>, <code>&lt;style&gt;</code>, etc, you need to manipulate just for XML validation although it's valid HTML</p>
<p>The following updates code-like html to a valid XML syntax.</p>
<pre><code>export function getHtmlError(html) {
  const parser = new DOMParser();
  const htmlForParser = `&lt;xml&gt;${html}&lt;/xml&gt;`
    .replace(/(src|href)=&quot;.*?&amp;.*?&quot;/g, '$1=&quot;OMITTED&quot;')
    .replace(/&lt;script[\s\S]+?&lt;\/script&gt;/gm, '&lt;script&gt;OMITTED&lt;/script&gt;')
    .replace(/&lt;style[\s\S]+?&lt;\/style&gt;/gm, '&lt;style&gt;OMITTED&lt;/style&gt;')
    .replace(/&lt;pre[\s\S]+?&lt;\/pre&gt;/gm, '&lt;pre&gt;OMITTED&lt;/pre&gt;')
    .replace(/&amp;nbsp;/g, '&amp;#160;');

  const doc = parser.parseFromString(htmlForParser, 'text/xml');
  if (doc.documentElement.querySelector('parsererror')) {
    console.error(htmlForParser.split(/\n/).map( (el, ndx) =&gt; `${ndx+1}: ${el}`).join('\n'));
    return doc.documentElement.querySelector('parsererror');
  }
}
</code></pre>


blocks|key|603323|text|在@Tarun上面的答案上进行扩展：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|603324|​|603325|function+validHTML(html)+{+//+checks+the+validity+of+html,+requires+all+tags+and+property-names+to+only+use+alphabetical+characters+and+numbers+(and+hyphens,+underscore+for+properties)
++++html+=+html.toLowerCase().replace(/(?<=<[%5E>]%2B?=\s*"[%5E"]*)[<>]/g,"").replace(/(?<=<[%5E>]%2B?=\s*'[%5E']*)[<>]/g,"");+//+remove+all+angle+brackets+from+tag+properties
++++html+=+html.replace(/<script.*?<\/script>/g,+'');++//+Remove+all+script-elements
++++html+=+html.replace(/<style.*?<\/style>/g,+'');++//+Remove+all+style+elements+tags
++++html+=+html.toLowerCase().replace(/<[%5E>]*\/\s?>/g,+'');++++++//+Remove+all+self+closing+tags
++++html+=+html.replace(/<(\!%7Cbr%7Chr%7Cimg).*?>/g,+'');++//+Remove+all+<br>,+<hr>,+and+<img>+tags
++++//var+tags=[...str.matchAll(/<.*?>/g)];+this+would+allow+for+unclosed+initial+and+final+tag+to+pass+parsing
++++html+=+html.replace(/%5E[%5E<>]%2B%7C[%5E<>]%2B$%7C(?<=>)[%5E<>]%2B(?=<)/gs,"");+//+remove+all+clean+text+nodes,+note+that+<+or+>+in+text+nodes+will+result+in+artefacts+for+which+we+check+and+return+false
++++tags+=+html.split(/(?<=>)(?=<)/);
++++if+(tags.length%252==1)+{
++++++++console.log("uneven+number+of+tags+in+"%2Bhtml)
++++++++return+false;
++++}
++++var+tagno=0;
++++while+(tags.length>0)+{
++++++++if+(tagno==tags.length)+{
++++++++++++console.log("these+tags+are+not+closed:+"%2Btags.slice(0,tagno).join());
++++++++++++return+false;
++++++++}
++++++++if+(tags[tagno].slice(0,2)=="</")+{
++++++++++++if+(tagno==0)+{
++++++++++++++++console.log("this+tag+has+not+been+opened:+"%2Btags[0]);
++++++++++++++++return+false;
++++++++++++}
++++++++++++var+tagSearch=tags[tagno].match(/<\/\s*([\w\-\_]%2B)\s*>/);
++++++++++++if+(tagSearch===null)+{
++++++++++++++++console.log("could+not+identify+closing+tag+"%2Btags[tagno]%2B"+after+"%2Btags.slice(0,tagno).join());
++++++++++++++++return+false;
++++++++++++}+else+tags[tagno]=tagSearch[1];
++++++++++++if+(tags[tagno]==tags[tagno-1])+{
++++++++++++++++tags.splice(tagno-1,2);
++++++++++++++++tagno--;
++++++++++++}+else+{
++++++++++++++++console.log("tag+'"%2Btags[tagno]%2B"'+trying+to+close+these+tags:+"%2Btags.slice(0,tagno).join());
++++++++++++++++return+false;
++++++++++++}
++++++++}+else+{
++++++++++++tags[tagno]=tags[tagno].replace(/(?<=<\s*[\w_\-]%2B)(\s%2B[\w\_\-]%2B(\s*=\s*(".*?"%7C'.*?'%7C[%5E\s\="'<>`]%2B))?)*/g,"");+//+remove+all+correct+properties+from+tag
++++++++++++var+tagSearch=tags[tagno].match(/<(\s*[\w\-\_]%2B)/);
++++++++++++if+((tagSearch===null)+%7C%7C+(tags[tagno]!="<"%2BtagSearch[1]%2B">"))+{
++++++++++++++++console.log("fragmented+tag+with+the+following+remains:+"%2Btags[tagno]);
++++++++++++++++return+false;
++++++++++++}
++++++++++++var+tagSearch=tags[tagno].match(/<\s*([\w\-\_]%2B)/);
++++++++++++if+(tagSearch===null)+{
++++++++++++++++console.log("could+not+identify+opening+tag+"%2Btags[tagno]%2B"+after+"%2Btags.slice(0,tagno).join());
++++++++++++++++return+false;
++++++++++++}+else+tags[tagno]=tagSearch[1];
++++++++++++tagno%2B%2B;
++++++++}
++++}
++++return+true;
}|code-block|syntax|javascript|603326|603327|这将执行一些额外的检查，例如测试标记是否匹配以及属性是否会被解析。因为它不依赖于现有的DOM，所以可以在服务器环境中使用，但要注意:它很慢。此外，从理论上讲，标记的名称可以宽松得多，因为您基本上可以在标记名称和属性名称中使用任何unicode+(只有几个例外)。然而，这不会通过我自己的理智检查。|603328|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|P|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|R|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|M|$]]

<p>Expanding on @Tarun's answer from above:</p>
<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>function validHTML(html) { // checks the validity of html, requires all tags and property-names to only use alphabetical characters and numbers (and hyphens, underscore for properties)
    html = html.toLowerCase().replace(/(?&lt;=&lt;[^&gt;]+?=\s*"[^"]*)[&lt;&gt;]/g,"").replace(/(?&lt;=&lt;[^&gt;]+?=\s*'[^']*)[&lt;&gt;]/g,""); // remove all angle brackets from tag properties
    html = html.replace(/&lt;script.*?&lt;\/script&gt;/g, '');  // Remove all script-elements
    html = html.replace(/&lt;style.*?&lt;\/style&gt;/g, '');  // Remove all style elements tags
    html = html.toLowerCase().replace(/&lt;[^&gt;]*\/\s?&gt;/g, '');      // Remove all self closing tags
    html = html.replace(/&lt;(\!|br|hr|img).*?&gt;/g, '');  // Remove all &lt;br&gt;, &lt;hr&gt;, and &lt;img&gt; tags
    //var tags=[...str.matchAll(/&lt;.*?&gt;/g)]; this would allow for unclosed initial and final tag to pass parsing
    html = html.replace(/^[^&lt;&gt;]+|[^&lt;&gt;]+$|(?&lt;=&gt;)[^&lt;&gt;]+(?=&lt;)/gs,""); // remove all clean text nodes, note that &lt; or &gt; in text nodes will result in artefacts for which we check and return false
    tags = html.split(/(?&lt;=&gt;)(?=&lt;)/);
    if (tags.length%2==1) {
        console.log("uneven number of tags in "+html)
        return false;
    }
    var tagno=0;
    while (tags.length&gt;0) {
        if (tagno==tags.length) {
            console.log("these tags are not closed: "+tags.slice(0,tagno).join());
            return false;
        }
        if (tags[tagno].slice(0,2)=="&lt;/") {
            if (tagno==0) {
                console.log("this tag has not been opened: "+tags[0]);
                return false;
            }
            var tagSearch=tags[tagno].match(/&lt;\/\s*([\w\-\_]+)\s*&gt;/);
            if (tagSearch===null) {
                console.log("could not identify closing tag "+tags[tagno]+" after "+tags.slice(0,tagno).join());
                return false;
            } else tags[tagno]=tagSearch[1];
            if (tags[tagno]==tags[tagno-1]) {
                tags.splice(tagno-1,2);
                tagno--;
            } else {
                console.log("tag '"+tags[tagno]+"' trying to close these tags: "+tags.slice(0,tagno).join());
                return false;
            }
        } else {
            tags[tagno]=tags[tagno].replace(/(?&lt;=&lt;\s*[\w_\-]+)(\s+[\w\_\-]+(\s*=\s*(".*?"|'.*?'|[^\s\="'&lt;&gt;`]+))?)*/g,""); // remove all correct properties from tag
            var tagSearch=tags[tagno].match(/&lt;(\s*[\w\-\_]+)/);
            if ((tagSearch===null) || (tags[tagno]!="&lt;"+tagSearch[1]+"&gt;")) {
                console.log("fragmented tag with the following remains: "+tags[tagno]);
                return false;
            }
            var tagSearch=tags[tagno].match(/&lt;\s*([\w\-\_]+)/);
            if (tagSearch===null) {
                console.log("could not identify opening tag "+tags[tagno]+" after "+tags.slice(0,tagno).join());
                return false;
            } else tags[tagno]=tagSearch[1];
            tagno++;
        }
    }
    return true;
}</code></pre>
</div>
</div>
</p>
<p>This performs a few additional checks, such as testing whether tags match and whether properties would parse. As it does not depend on an existing DOM, it can be used in a server environment, but beware: it is slow. Also, in theory, tags can be names much more laxly, as you can basically use any unicode (with a few exceptions) in tag- and property-names. This would not pass my own sanity-check, however.</p>


<p>I need a reliable JavaScript library / function to check if an HTML snippet is valid that I can call from my code. For example, it should check that opened tags and quotation marks are closed, nesting is correct, etc.</p>
<p>I don't want the validation to fail because something is not 100% standard (but would work anyway).</p>


Check if HTML snippet is valid with JavaScript

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jQuery

我需要一个可靠的HTML库/函数来检查JavaScript片段是否有效，以便从我的代码中调用。例如，它应该检查打开的标签和引号是否关闭，嵌套是否正确等。我不希望验证失败，因为有些东西不是100%标准的(但无论如何都会工作)。

问检查HTML代码片段是否对JavaScript有效
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