mismatched tag. Expected: </br>

Question

so I get this error when I load my html onto a container.

mismatched tag. Expected: </br>.

when I open it, it just points to a div tag (line 17). I have no idea what's going on, can anybody explain what's happening?

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<br>
<div class="panel.group" id="accordion">
	<div class="panel panel-default">
		<div class="panel-heading">
      	<h3 class="panel-title">
         <a data-toggle="collapse" data-parent="#accordion" href="#collapseOne">Končani Projekti</a>
         </h3>
		</div>
      <div id="collapseOne" class="panel-collapse collapse in">
      	<div class="panel-body">      		
				<img src="images/knjiznica-screenshot-thumbnail.jpg" class="img-thumbnail" id="knjiznica-IJS-link" alt="knjiznica webpage" />
				<h5 class="accordion-text-heading">Prenova domače spletne strani knjižnice IJS</h5>
				<br>
				<img src="images/grafi-screenshot-thumbnail.jpg" class="img-thumbnail" id="grafi-IJS-link" alt="javascript graf IJS" />
				<h5 class="accordion-text-heading">Interaktivni grafi</h5>
				<p>Spletna stran s strežnika prebere .csv datoteke, ter iz njih naredi interaktivni graf. Možnost izbire katero datoteko odpira, prisotnost vrednosti na grafu(klik na legendo). Zaradi varnosti podatkov so imena podjetij ter ustanov spremenjena v angleške števnike.</p>
      	</div>
      </div>
	</div>
   <div class="panel panel-default">
		<div class="panel-heading">
      	<h3 class="panel-title">
         <a data-toggle="collapse" data-parent="#accordion" href="#collapseTwo">Trenutni Projekti</a>
         </h3>
		</div>
      <div id="collapseTwo" class="panel-collapse collapse">
      	<div class="panel-body">
         	<h5 class="accordion-text-heading">- jadijada</h5>  	
        	</div>
      </div>
	</div>	
</div>

<script>
	$("#knjiznica-IJS-link").click(function() {
		window.open('http://topdeckandwreck.com/knjiznica%20IJS_table/public_html/Defsi.html');
	});
	$("#grafi-IJS-link").click(function() {
		window.open('http://topdeckandwreck.com/grafiIJS/');
	});
</script>

Answer 1

You are probably using the xhtml doctype. For that you need to close the <br> tag like any other xml tag. Have a try using <br /> instead of <br>.