Native HTML details element styled via CSS – customized

index.html

<div class="card">
  <h1>Coronavirus - Facts, advice and measures</h1>
  
  <details class="warning">
    <summary>Facts and knowledge about COVID-19</summary>
    <p>Some text to be hidden.</p> 
    <p>Some text to be hidden.</p> 
    <p>Some text to be hidden.</p> 
    <p>Some text to be hidden.</p> 
  </details>
  
  <details class="info" open>
    <summary>For the public</summary>
    <p>Social distance, quarantine and isolation</p>
    <p>Hand hygiene, cough etiquette, cleaning and laundry</p>
    <p>When children have acute respiratory tract infections</p>
    <p>Risk groups and their relatives</p>
  </details>
  
  <details class="alert">
    <summary>Facts and knowledge about COVID-19</summary>
    <p>Some text to be hidden.</p> 
    <p>Some text to be hidden.</p> 
    <p>Some text to be hidden.</p> 
    <p>Some text to be hidden.</p> 
  </details>
</div>

native-html-details-element-styled-via-css-customized.markdown

Native HTML details element styled via CSS – customized

Rebound shot from Dribbble to implement an accordion-like element using only the details/summary native HTML element and CSS.

Check the Dribbble shot over at: https://dribbble.com/shots/14907895-Native-HTML-details-element-styled-via-CSS.

Best results can be seen in Chrome or Blink-based browsers. Firefox and others have decent results as well, but they could be improved creating alternative open/close icons.

A Pen by dennyferd on CodePen.

License.

style.scss

/*
Native <details> element styling
AUTHOR: https://codepen.io/nicolasjengler 

+ replaced list-item styling with flex and pseudo-element content on summary => vertically aligned sign with summary content
+ added selection and focus outline matching detail style
+ addede custom list-style-type
  - corona-warning  
  - corona-info
  - corona-alert
+ fix body hehight –> min-height: 
  allow scroll on all details opened
*/


@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&display=swap');

:root {
  --color-bg: #EEEDEB;
  --color-title: #0E1C4E;
  
  --color-summary-1: #FFF6EE;
  --color-summary-1-highlight: #FFC48B;
  --color-summary-2: #FAFAFF;
  --color-summary-2-highlight: #B4B3FF;
  --color-summary-3: #FFF0F3;
  --color-summary-3-highlight: #FFB3C0;
  
  --font-ibm-plex-sans: 'IBM Plex Sans', sans-serif;
}

html,
body {
  overflow: auto;
  min-height: 100vh;
  width: 100%;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card {
  background: white;
  padding: 38px 36px;
  margin-top: 40px;
  margin-bottom: 40px;
  border-radius: 4px;
  box-shadow: 0 8px 10px rgba(0, 0, 0, .1);
  max-width: 30em;
  width: 100%;
  
  h1 {
    font-family: var(--font-ibm-plex-sans);
    font-style: normal;
    font-weight: bold;
    font-size: 20px;
    line-height: 1.2;
    color: var(--color-title);
    margin-bottom: 20px;
  }
  
  details {
    display: flex;
    
    border-radius: 5px;
    overflow: hidden;
    background: rgba(0, 0, 0, .05);
    border-left: 15px solid gray;
    padding:15px;
    & {
      margin-top: 15px;
    }
    
    &.warning {
       --highlight: var(--color-summary-1-highlight) ;
      background: var(--color-summary-1);
      border-left-color: var(--color-summary-1-highlight);
      p {
        list-style-type: corona-warning;
      }
    }
    
    &.info {
       --highlight: var(--color-summary-2-highlight) ;
      background: var(--color-summary-2);
      border-left-color: var(--color-summary-2-highlight);
      p {
        list-style-type: corona-info;
      }
    }
    
    &.alert {
      --highlight: var(--color-summary-3-highlight) ;
      background: var(--color-summary-3);
      border-left-color: var(--highlight);
      p {
        list-style-type: corona-alert;
      }
    }
    
    summary,p {
      position:relative;
      display:flex;
      flex-direction:row;
      align-content: center;
      justify-content: flex-start;
      font-family: var(--font-ibm-plex-sans);
      font-style: normal;
      font-weight: normal;
      font-size: 18px;
      color: var(--color-title);
      padding: 20px;
      cursor:pointer;
      &::-webkit-details-marker {
        display:none;
      }
      &:focus {
        outline: solid 3px var(--highlight);
      }
      &::selection {
        background-color:var(--highlight);
      }
    }
    p {
      display: list-item;
      cursor:default;
      margin-left:3rem;
      list-style-type: corona;
    }
    
    summary::before {
      cursor: pointer;
      position:absolute;
      display:inline-flex;
      width:1rem;
      height:1rem;
      left: 0rem;
      margin-right:.5rem;
      content: url("data:image/svg+xml,%3Csvg width='100%' height='100%' viewBox='0 0 24 24' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M22.6066 12H1.3934' stroke='%23202842' stroke-width='1.875' stroke-linecap='round' stroke-linejoin='round'/%3E%3Cpath d='M12 1.39343V22.6066' stroke='%23202842' stroke-width='1.875' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E%0A");

    }
    
    &[open] {
      summary {
        
        font-weight: 700;

        &::before {
          transform: rotate(45deg);
          content: url("data:image/svg+xml,%3Csvg width='100%' height='100%' viewBox='0 0 24 24' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M22.6066 12H1.3934' stroke='%23202842' stroke-width='3.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3Cpath d='M12 1.39343V22.6066' stroke='%23202842' stroke-width='3.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E%0A");
        }
      }
    }
  }
}

@counter-style corona-warning {
  system: cyclic;
  symbols: 🧼 🩺 👩🏻‍⚕️ 🚑;
  suffix: " ";
}
@counter-style corona-info {
  system: cyclic;
  symbols: 🧬;
  suffix: " ";
}
@counter-style corona-alert {
  system: fixed;
  symbols: 💉 🩸 😷 🦠 🧫;
  suffix: " ";
}