{% load wagtailadmin_tags %}
{% comment "text/markdown" %}
    Variables this template accepts:

    dialog_id - The ID of the dialog you are toggling open
    classname - CSS classes for styling the button
    text - The text of the button
{% endcomment %}
<button type="button" class="{{ classname }}" data-a11y-dialog-show="{{ dialog_id }}">
    {{ text }}
</button>