Have block level element fill 100% width of overflow-x: scroll container - html

Question

I've got a container element that's a certain width, with overflow-x: auto. In it I have a block level header element (h1) that's supposed to, being a block element, fill the container horizontally. And it does so, as long as there are no other elements in the container that overflow, creating a horizontal scrollbar. If there are overflowing elements, then the header element fills only the non-overflowing horizontal space of the container, but doesn't appear in the overflowing space.
Fiddle demonstrating the problem: http://jsfiddle.net/rand0mbits/qUh3s/
HTML:
<div id="one">
<h1>header</h1>
<table><tr><td>text</td><td>text</td><td>text</td><td>text</td><td>text</td>
<td>text</td></tr></table>
</div>
CSS:
#one {
width: 200px;
overflow: auto;
border: solid 1px;
}
#one h1 {
font-size 1.1em;
background-color: blue;
display: inline-block;
width: 100%;
margin-top: 0;
}
table td {
border: solid 1px;
padding: 20px;
}
How do i make the <h1> fill the whole width of the container?

Answer 1

See the fiddle.
Use the HTML caption element:
<div id="one">
<table>
<caption>
<h1>header</h1>
</caption>
<tr>
<td>text</td>
<td>text</td>
<td>text</td>
<td>text</td>
<td>text</td>
<td>text</td>
</tr>
</table>
</div>
CSS:
#one {
width: 200px;
overflow: auto;
border: solid 1px;
}
#one h1 {
font-size 1.1em;
background-color: blue;
margin-top: 0;
text-align: left;
}
table td {
border: solid 1px;
padding: 20px;
}

Answer 2

The H1 is going to inherit the width of its parent element since it's relative, so it will always end up being the same width you set #one to.
What you can do is instead of #one having overflow: auto, wrap the table inside another DIV with overflow: auto. This way, #one stays a fixed width, but the wrapper around the table, allows the content to scroll horizontally.
jsfiddle: http://jsfiddle.net/yetti/Ggua5/

Answer 3

Try this:
css
#one {
width: 200px;
overflow: auto;
border: solid 1px;
}
#one h1 {
font-size 1.1em;
background-color: blue;
display: inline-block;
width: 100%;
margin-top: 0;
position:relative;
}
table td {
border: solid 1px;
padding: 20px;
}
h1:after {
content:"";
background: blue;
position: absolute;
top: 0;
bottom: 0;
width: 100%;
left:100%
}
fiddle

Answer 4

Change this CSS code like the following then check and let me know if you want this:
#one {
width: 100%;
overflow: auto;
border: solid 1px;
}