There is no such thing as maxlenght
- use maxlength
instead.
Here's a jsFiddle.
HTML:
<div id="9irBGsdLR">
<form method="POST" class="form" name="frontContent" id="forntContent" style="margin-bottom:15px;">
<div id="9button" style="float:right;">
<img onclick="deleteElement('9', '9irBGsdLR', this, 'actions/delete.php')" alt="delete" style="border:0px;float:right;cursor:pointer;" src="./validationNotWorking_files/close_32.png">
</div>
<input type="text" name="id" style="display:none;" value="9">
<label class="inputlabel softInputlabel" style="width:20%;">Headline: </label>
<input maxlength="50" type="text" name="title" id="title" class="inputfield" contenttype="text" value="Praesent rhoncus faucibus elementum">
<label class="inputlabel softInputlabel" style="width:20%;">Succession: </label>
<input maxlength="4" type="text" name="succession" id="title" class="inputfield" contenttype="numerical" value="50">
<label class="inputlabel softInputlabel" style="width:20%;">Content: </label>
<textarea class="formField" style="width:75%;height:300px;" name="content"></textarea>
</form>
<hr>
</div>