<div class="mw-collapsible mw-collapsed" style="width:100%>
First, you're missing the closing quote on the style
attribute.
Second, you have not closed any of these DIVs. You open them but never close them.
<div class="mw-collapsible mw-collapsed" style="width:100%>
===Item: Camera===
<div class="mw-collapsible-content">
*"Gotcha!"
*"Hope you're photogenic."
*"Say cheeseburger!"
*"Now!"
*"Say cheese!"
</div>
<!-- Where is the </div> ? -->
<div class="mw-collapsible mw-collapsed" style="width:100%>
Also, the "width:100%" is completely unnecessary which is why it kind of works even though the style
attribute is broken. DIVs are block elements, they have a default of width:auto
which is the same as width:calc(100% - borderWidth - paddingWidth)
.