You can style an element with css if its id attribute matches the window location’s hash using the :target pseudo-class:
<style>
#content {
display: none;
}
#content:target {
display: block
}
</style>
<a href="#content">See hidden content</a>
<table id="content">
<legend>Keep is secret!
<tr>
<td>Keep it safe!
</table>
https://developer.mozilla.org/en-US/docs/Web/CSS/:target