HTML Unclosed Tag Finder

unclosedTagFinder.txt

<!--demo: http://jona.ca/blog/unclosed-tag-finder/ -->
<!--source: http://jonathanaquino.com/unclosedTagFinder.txt -->

<textarea id="unclosed-tag-finder-input" style="width:100%;height:300px">
</textarea>
<div><input type="button" id="unclosed-tag-finder-button" value="Submit" ></input></div>
<br />
<h3>Results</h3>
<pre id="unclosed-tag-finder-results">
</pre>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>

<script type="text/javascript">
//<![CDATA[
function isSelfClosingTag(tagName) {
    return tagName.match(/area|base|br|col|embed|hr|img|input|keygen|link|menuitem|meta|param|source|track|wbr|script/i);
}

$('#unclosed-tag-finder-button').click(function () {
    var input = $('#unclosed-tag-finder-input').val();
    var tags = [];
    $.each(input.split('\n'), function (i, line) {
        $.each(line.match(/<[^>]*[^/]>/g) || [], function (j, tag) {
            var matches = tag.match(/<\/?([a-z0-9]+)/i);
            if (matches) {
                tags.push({tag: tag, name: matches[1], line: i+1, closing: tag[1] == '/'});
            }
        });
    });
    if (tags.length == 0) {
        $('#unclosed-tag-finder-results').text('No tags found.');
        return;
    }
    var openTags = [];
    var error = false;
    var indent = 0;
    for (var i = 0; i < tags.length; i++) {
        var tag = tags[i];
        if (tag.closing) {
            var closingTag = tag;
            if (isSelfClosingTag(closingTag.name)) {
                continue;
            }
            if (openTags.length == 0) {
                $('#unclosed-tag-finder-results').text('Closing tag ' + closingTag.tag + ' on line ' + closingTag.line + ' does not have corresponding open tag.');
                return;
            }
            var openTag = openTags[openTags.length - 1];
            if (closingTag.name != openTag.name) {
                $('#unclosed-tag-finder-results').text('Closing tag ' + closingTag.tag + ' on line ' + closingTag.line + ' does not match open tag ' + openTag.tag + ' on line ' + openTag.line + '.');
                return;
            } else {
                openTags.pop();
            }
        } else {
            var openTag = tag;
            if (isSelfClosingTag(openTag.name)) {
                continue;
            }
            openTags.push(openTag);
        }
    }
    if (openTags.length > 0) {
        var openTag = openTags[openTags.length - 1];
        $('#unclosed-tag-finder-results').text('Open tag ' + openTag.tag + ' on line ' + openTag.line + ' does not have a corresponding closing tag.');
        return;
    }
    $('#unclosed-tag-finder-results').text('Success: No unclosed tags found.');
});
//]]>
</script>