title: Chrome extension inject HTML modal popup
body: <p>I am trying to use a Chrome extension to inject an <a href="/questions/tagged/html" class="post-tag" title="show questions tagged &#39;html&#39;" rel="tag">html</a> modal popup (like <a href="https://www.w3schools.com/howto/howto_css_modals.asp" rel="nofollow noreferrer" title="howto_css_modals">this</a> one: uses <a href="/questions/tagged/css" class="post-tag" title="show questions tagged &#39;css&#39;" rel="tag">css</a>, <a href="/questions/tagged/js" class="post-tag" title="show questions tagged &#39;js&#39;" rel="tag">js</a>, and <a href="/questions/tagged/html" class="post-tag" title="show questions tagged &#39;html&#39;" rel="tag">html</a>). Basically, I have <a href="/questions/tagged/nodejs" class="post-tag" title="show questions tagged &#39;nodejs&#39;" rel="tag">nodejs</a> to send an announcement to the background file, and it has successfully triggered a function. I want that function, though, to be able to inject the modal popup and show it on the screen. Thanks for any help!</p>