docs/_snippets/framework/extending-content-custom-figure-attributes.html
<head>
<style>
.ck-content figure.table-foo table,
.ck-content figure.img-foo {
border: 2px solid deeppink;
}
</style>
</head>
<div id="snippet-custom-figure-attributes">
<h2>Image:</h2>
<figure class="image">
<img alt="bar" class="img-foo" id="img-foo-1" src="%BASE_PATH%/assets/img/fields.jpg">
<figcaption>Caption</figcaption>
</figure>
<h2>Table:</h2>
<table class="table-foo" id="table-foo-1" >
<tr>
<td>foo</td>
</tr>
</table>
</div>