HTML5 provides the contenteditable attribute which makes most HTML elements editable. Shown below is code to make a div element editable.
<div id="editbox" style="border-style:solid; border-width:1px; height:200px; width:300px" contenteditable="true"></div>
Possible values for the contenteditable attribute are true, false, or inherit. inherit sets an element's editability to the same as its parent element. The default value is false, which makes an element NOT editable.
The contenteditable attribute is compatible with most current browsers, including Internet Explorer 6 and higher, Firefox 3.5 and higher, and Chrome 4.0 and higher.
Once you make an HTML element editable, it's assumed that you would want to get the text out of it. Shown below is example code that creates a JavaScript function to access an element's contents, and creates a form button to call that function. Of course you might want to submit that contents to the server. How to that is not explained here because it depends upon the language and method you want to use.
<script>
function showText()
{
alert(document.getElementById("editbox").innerHTML);
}
</script>
<form>
<input type="button" value="Save" onclick="showText()">
</form>
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