I have issues with Twitter share button, I have this code as an input:
<meta name="twitter:card" content="summary">
<meta name="twitter:site" content="@citydesigning">
<meta name="twitter:title" content="City Design">
<meta name="twitter:description" content="I recommend this epic City Design online course at https://stepic.org/city #stepiccity">
<meta name="twitter:creator" content="citydesigning">
<meta name="twitter:image:src" content="https://stepic.org/static/classic/city/images/sharepic.png">
and
<a class="twitter"
href="https://twitter.com/intent/tweet?url=https://stepic.org/city"
target="_blank"></a>
But it returns no results when sharing, only this text: "https://stepic.org/city" instead of all Twitter card information (like image and some text) when clicking "View summary" on Twitter's feed.
Can you help me, pleasee?