CSS - Table caption to apply to each tbody - html

Question

*Note, this question has basically been overhauled from a previous version so as to be more precise. Thus some of the answers below do not completely the restructed question.
I have two sets of data which I need to display tabulated. As both sets of data need to have the column widths (but still be dynamic), I am using two <tbody>'s.
I am trying to set a heading for each of the tabulated data, in a way that the heading takes up the width of the entire <tbody>.
I have tried using table-caption, but it does not apply to the tbody, but the table itself. Meaning all captions look to go to the top of the table, regardless of where they are in the html.
To demonstrate what I am running into, see the following snippet:
table {
width: 100%;
border-collapse: collapse;
color: black;
margin-bottom: 2px;
}
tbody:before {
display: table-caption;
font-size: 1.25em;
padding: 16px;
background-color: #303030;
font-weight: bold;
color: white;
width: 100%;
}
#tbody1:before {
content: 'tbody1';
}
#tbody2:before {
content: 'tbody2';
}
th,
td {
padding: 4px 0px;
border: 1px solid black;
}
caption {
border: 1px dotted black;
}
<table>
<tbody id="tbody1">
<caption>Caption1</caption>
<tr>
<th>bob</th>
<th>dob</th>
</tr>
</tbody>
<tbody id="tbody2">
<caption>Caption2</caption>
<tr>
<th>dob</th>
<th>bob</th>
</tr>
</tbody>
</table>
My current attempt is to use :before. But as you can see, the :before does not take up the entire width of the tbody. Even with width: 100% it does not work.
Another way I realized it could be done is to have another row for each tbody, and set colspan to equal the amount of columns for that table. Like this:
table {
width: 100%;
border-collapse: collapse;
color: black;
margin-bottom: 2px;
}
th,
td {
padding: 4px 0px;
border: 1px solid black;
}
caption {
border: 1px dotted black;
}
<table>
<tbody id="tbody1">
<tr>
<th colspan="2">Title1</th>
</tr>
<tr>
<th>bob</th>
<th>dob</th>
</tr>
</tbody>
<tbody id="tbody2">
<tr>
<th colspan="2">Title2</th>
</tr>
<tr>
<th>dob</th>
<th>bob</th>
</tr>
</tbody>
</table>
However, the only problem there is that it does not become dynamic and requires you to know how many columns there will be ahead of time. Normally this would not be a problem but I am looking for a more dynamic solution in my case.
My question is: How does one add a caption to a tbody (not the table) in a way so that each caption relates to the applicable tbody and not the table

Answer 1

You just need to set the width to 100vw. This sets the width to 100% of the viewport width. For a more in-depth explanation of viewport width, see this article.
table {
width: 100%;
border-collapse: collapse;
color: black;
margin-bottom: 2px;
}
#tbody1:before, #tbody2:before {
display: table-caption;
font-size: 1.25em;
padding: 16px;
background-color: #303030;
font-weight: bold;
color: white;
width: 100vw;
}
#tbody1:before {
content: 'tbody1';
}
#tbody2:before {
content: 'tbody2';
}
th, td {
padding: 4px 0px;
border: 1px solid black;
}
<table>
<tbody id="tbody1">
<tr>
<th>bob</th>
</tr>
</tbody>
<tbody id="tbody2">
<tr>
<th>dob</th>
</tr>
</tbody>
</table>