JavaScript

Document Object Model

<html>
  <head>
    <title>Space Race!</title>
  </head>
  <body>
    <h1>First Space mission</h1>
    <p>
      On Oct. 4, 1957, the U.S.S.R launched the first artificial satellite, <span style="font-weight: 700">Sputnik 1</span>, into space.
    </p>

    <h1>Second Space mission</h1>
    <p>
      On April 12, 1961, the Russian <span style="font-weight: 700">Lt. Yuri Gagarin</span> became the first human to orbit Earth in Vostok 1.
    </p>
  </body>
</html>