title: How to make MatTooltip to be visible on focus instead of hover?
body: <p>Is there a way in which I can set the tooltip to be visible on focus instead of upon hovering?</p>
  <p>I've tried to understand from angular official documentation and search similar question on SO including this one <a href="https://stackoverflow.com/questions/44959479/always-show-tooltip-angular-material2">Always Show Tooltip ( Angular Material2)</a>, but I don't see something helpful so far.</p>
  <p>My code is:</p>
  <pre><code>&lt;input
    matTooltipPosition=&quot;above&quot;
    matTooltipClass=&quot;my-tooltip&quot;
    matTooltip='Fill in the field and then click &quot;Enter&quot;'
    (focus)=&quot;tooltip.show()&quot;
    #tooltip=&quot;matTooltip&quot;&gt;
  </code></pre>
  <p>I also tried <code>TooltipVisibility = &quot;Visible&quot;</code> with no success</p>