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HTML

              
                <link href="https://fonts.googleapis.com/css2?family=Lato&display=swap" rel="stylesheet">

<div class="wrapper">


    <h2 class="headline" id="main-headline">
      Frequent Questions about HTML, CSS and Javascript
    </h2>
    <p class="headline headline__text">
      Click the below tabs to expand the questionary.
    </p>

    <div id="FAQ">
      <div onclick="toggleOff(this)" class="oneFAQ">

        <div class="question">
          <span class="headline headline__med headline--bold">What is semantic HTML?</span>
        </div>

        <div class="answer">
          <p class="headline headline__text">Semantic HTML is a coding style. It is the use of HTML markup to reinforce the semantics or meaning of the content. For example: In semantic HTML <b> </b> tag is not used for bold statement as well as <i> </i> tag is used for italic. Instead of these we use <strong></strong> and <em></em> tags.</p>
        </div>
      </div>

      <div onclick="toggleOff(this)" class="oneFAQ">

        <div class="question">
          <span class="headline headline__med">What is JavaScript(JS)?</span>
        </div>

        <div class="answer show">
          <p class="headline headline__text">JavaScript is a lightweight, interpreted programming language with object-oriented capabilities that allows you to build interactivity into otherwise static HTML pages.</p>
        </div>
      </div>

      <div onclick="toggleOff(this)" class="oneFAQ">

        <div class="question">
          <span class="headline headline__med">What is a style sheet?</span>
        </div>

        <div class="answer">
          <p class="headline headline__text">A style sheet is used to build a consistent, transportable, and well-designed style template. You can add these templates on several different web pages. It describes the look and formatting of a document written in markup language.</p>
        </div>
      </div>

      
    </div> <!-- FAQ -->

</div> <!-- wrapper -->
              
            
!

CSS

              
                body {
  font-family: 'Lato', sans-serif;
}

.wrapper {
  max-width: 960px;
  margin: 10px auto;
}


select {
  width: 100%;
  display: block;
  box-sizing: border-box;
  padding: 0 10px;
  height: 40px;
  margin-bottom: 15px;
  border: 1px solid #cdcdcd;
  outline: none;
}

.oneFAQ {
  margin: 0;
  border-radius: 4px;
  border-top: 1px solid gray;
  border-bottom: 1px solid gray;
}

.question {
  background-color: #ececec;
  padding: 7px 15px;
  cursor: pointer;
}

.answer {
  background-color: #fbfbfb;
  position: absolute;
  visibility: hidden;

  padding: 7px 15px;
}

.headline {
  font-size: 2.2rem;
}

.headline__med {
  font-size: 1.5rem;
}

.headline__text {
  font-size: 1.25rem;
}

.headline--bold {
  font-size: 1.5rem;
}

.show {
  position: relative;
  visibility: visible;
}

              
            
!

JS

              
                function toggleOff(e) {
  // Colasping all the FAQs items
  let AllAnswer = document.querySelectorAll(".answer");
  AllAnswer.forEach((answer) => {
    if (answer !== e) {
      answer = answer.classList;
      answer.remove("show");
    }
  });

  // Showing only the clicked FAQ item
  let answer = e.querySelector(".answer").classList;
  answer.contains("show") ? answer.remove("show") : answer.add("show");
}

document.addEventListener("DOMContentLoaded", (event) => {
  let headline = document.getElementById("main-headline");
  let FAQs = document.querySelectorAll(".oneFAQ");
  const FAQsArr = Array.from(FAQs);

  headline.innerHTML = `${headline.innerHTML} (${FAQsArr.length})`;
});

              
            
!
999px

Console