title: How to show Angular Material Tooltip on component initialization
body: <p>I want to show an Angular Material tooltip when its component is initialized/loaded.</p>
  
  <p>I know I can add an HTML attribute to show it when an event happens. My overall goal is to have the tooltip showing when the component loads, then hide after a few seconds.</p>
  
  <p>I've tried the following:</p>
  
  <pre><code>&lt;div (load)="tooltip.show()"
       #tooltip="matTooltip"
       matTooltip="blah blah"&gt;
  &lt;/div&gt;
  </code></pre>