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HTML 

              
                <div>
        <h1>
          No focusable element test
        </h1>
        <p>
          <strong>This test only works in browsers that have implemented the dialog element (and if necessary, a flag has been turned on to have it render)</strong>.
        </p>
        <p>
          This test is to show what happens if a dialog element has no focusable content, but focus is set to the dialog itself (using "invalid" tabindex=-1 on the dialog)
        </p>
     

      <p>
        <button onclick="showDialog(myDialog)">
          Open my dialog!
        </button>
      </p>

      <p>
        <button onclick="showDialog(myOtherDialog)">
          Open long dialog!
        </button>
      </p>

      <dialog id="my_dialog" tabindex=-1>
        <h1>My heading</h1>
        <p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p>
      </dialog>

      <dialog id="my_other_dialog" tabindex=-1>
        <h1>My heading</h1>
        <p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p><p>
          Nothing to focus here
        </p>
        <p>
          Nothing to focus at all.
        </p>
      </dialog>
  

	
<h2>Results</h2>
	<p>With <strong>Firefox and Chromium browsers paired with JAWS</strong>, either the heading will be announced, or the focused dialog will announce as "modal dialog".   Pressing down arrow will begin announcing the content of the dialog.  The heading can be skipped over by JAWS, but that seems something JAWS should fix.
<p>
	<strong>Narrator with Edge</strong> will announce "modal dialog" when focusing the dialog element.  For the long dialog test, Narrator will beging reading the contents of the dialog from start to end.
<p>
	<strong>Firefox and Chromium browsers</strong> with NVDA will start announcing the content of the dialog from start to finish.  

	<p>
		<strong>Safari Tech Preview and VoiceOver</strong> will immediately push VO focus to the heading of the dialog, announcing its contents and however many other items are in the "group" (odd to not say dialog... but looking in Safari's dev tools Node pannel > Accessibility, the dialog presently returns "no matching ARIA role", so maybe that's why?)

		<hr>
	
	<p>You can also check out <a href="https://scottaohara.github.io/testing/html-dialog/just-dialog.html">this dialog comparison test</a> for different behaviors when a focusable element or the dialog element itself is initially focused.</p>
		
		
</div>
!

CSS 

              
                body > div {
	max-width: 35em;
	padding: 1.5em;
}
!

JS 

              
                
const myDialog = document.getElementById('my_dialog');
const myOtherDialog = document.getElementById('my_other_dialog');

const showDialog = function ( el ) {
	el.showModal();
	el.focus();
}
const closeDialog = function ( el ) {
	el.close();
}
!
999px

Console