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CSS CSS Basics Understanding Values and Units Em and Rem Units

Posted by Kirby Adcock
Kirby Adcock
1,162 Points

The answer I got was 0.41666667ems for h3 due to it's parent h2 = 48px and h2's parent html = 16px. How am I wrong?

Create a new rule that targets the h3. Give the h3 a font-size value in ems of 20px.

style.css 
/* Complete the challenge by writing CSS below */

html {
  font-size: 16px;
}

header {
  font-size: 1.5em;
}

.heading {
  font-size: 5rem;
}
h2 {
  font-size: 3em;  
}
h3 {
  font-size: 0.41666667em;
}
index.html 
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Developer Diane: Resume</title>
  <link rel="stylesheet" href="page.css">
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <main>
    <header>
      <div id="header-box">
        <h1 class="heading">Developer Diane: Resume</h1>
        <address>
          <p>website: developerdiane.com</p>
          <p>email: diane@developerdiane.com</p>
        </address>
        <img src="developer-diane.jpg" alt="Developer Diane coding on her laptop.">
      </div>
    </header>          
    <section id="education">
      <h2>Education</h2>          
      <ul>
        <li>
          <h3><a href="https://teamtreehouse.com">Treehouse</a></h3>
          <p>Front End <em>Web Development</em> Techdegree</p>
          <p class="date special">Graduated January 2020</p>
        </li>
      </ul>
    </section>
    <section id="experience">
      <h2>Experience</h2>
      <ul>
        <li>
          <h3>Super Web Design Shop</h3>
          <p>Junior Developer</p>
          <p class="date special">February 2020-present</p>
        </li>
        <li>
          <h3>Pretty Good Websites, Inc.</h3>
          <p>Web Development Intern</p>
          <p class="date">July 2019-January 2020</p>
        </li>
      </ul>
    </section>
    <section>
      <h2>Skills</h2>
      <ul id="skills-list">
        <li class="top-skill">HTML</li>
        <li>CSS</li>
        <li class="top-skill" id="proud">JavaScript</li>
        <li>Git</li>
        <li>Bootstrap</li>
        <li class="top-skill">Mobile Web Development</li>
        <li>Accessibility</li>
      </ul>
    </section>
    <section>
      <h2>Awards and Achievements</h2>
      <ol>
        <li>Dev Ninja Award, November 2020</li>
        <li>Developer of the Month, October 2019</li>
        <li>Achieved rating of 6 kyu on <a href="https://www.codewars.com/">Codewars</a></li>
        <li>Certified Accessibility Specialist</li>
      </ol>
    </section>
    <footer>©2020 Developer Diane.</footer>
  </main>
</body>
</html>

2 Answers

leakedmemory
leakedmemory
12,178 Points
leakedmemory
leakedmemory
12,178 Points

Hi Kirby, I found this post because I made the same mistake. I assumed the h3 element was a child of the h2 element when it's actually a child of the html root.

David Lima
David Lima
3,879 Points
David Lima
David Lima
3,879 Points

Ive been banging my head against the wall for the better half of an hour and did not realize this until I read your comment. I still dont totally understand how it isnt considered a child oh h2 since its a list item, within a list nested within h2. There must be a fundamental thats skipping my mind right now. Thank very much any how.

leakedmemory
leakedmemory
12,178 Points

@David Lima h3 is not a child of h2 because it's not within <h2>...</h2>. In this case h2 and ul are siblings and h3 is a descendant of ul not h2.

I hope this explanation helps.

Mark Sebeck
MOD
Mark Sebeck
Treehouse Moderator 37,905 Points
Mark Sebeck
Mark Sebeck
Treehouse Moderator 37,905 Points

Hi Kirby Adcock. 1px represents 0.0625em based on the default font-size of 16 pixels. So 20px * .0625 = 1.25em. Here is a handy calculator.