To create interactive expand/collapse components, you can use the HTML <details> and <summary> tags; 1. <details> as container wrap content, <summary> as clickable title; 2. Content collapses by default, add open attributes to expand by default; 3. You can customize styles through CSS, such as hiding the default arrows, setting background colors and transition animations; 4. Applicable to FAQ, advanced options, collapse logs and other scenarios.

Creating interactive expand/collapse components using HTML <details></details> and <summary></summary> tags is actually quite straightforward. It does not require too much code to achieve a content area that can be expanded by default. These two tags can quickly create space-saving UI effects like "FAQ" and "Advanced Options".

Basic structure: <details></details> package content, <summary></summary> as title

<details></details> is the container of the entire component, while <summary></summary> is its first child element to display the clickable title. The browser automatically handles click behavior and expand/collapse status switching, without the need for additional JavaScript.

Example:

 <details>
  <summary>Click to expand more information</summary>
  <p>Here is what you want to hide or expand. </p>
</details>

• By default, the content is closed.
• Click the <summary> text section, and the content will expand or close again.
• If you want to expand by default, you can add the open attribute to <details> :

   <details open>
    <summary>Default expanded information</summary>
    <p>This paragraph was visible from the beginning. </p>
  </details>

Custom style: Don't let the default style limit you

Although the default style is already available, we usually want it to be more in line with the overall style of the website. You can beautify <summary> and the entire <details> component through CSS.

Some common style adjustment suggestions:

• Hide the default small arrow (triangle icon):

   summary::-webkit-details-marker {
    display: none;
  }

• Set custom icons or background colors:

   summary {
    cursor: pointer;
    padding: 10px;
    background-color: #f0f0f0;
    border-radius: 4px;
    position: relative;
    padding-right: 30px;
  }
  
  summary::after {
    content: '?';
    position: absolute;
    right: 10px;
    font-size: 0.8em;
    transition: transform 0.2s;
  }
  
  details[open] summary::after {
    content: '▼';
  }

• Controls animation transitions when expanding:

   details > *:not(summary) {
    transition: max-height 0.3s ease-out;
    max-height: 200px; /* Adjust according to content height*/
    overflow: hidden;
  }

Note: Different browsers support <details> slightly different, but modern mainstream browsers support it.

Practical application scenarios: FAQ, settings panel, advanced options, etc.

This combination is perfect for:

• FAQ : Each question is represented by a set of <details> <summary> , and users can click to view the answer.
• Advanced Settings Panel : The advanced options are hidden by default, and the user clicks "Show Advanced Settings" before expanding.
• Collapse log or explanation information : For example, in the management background, hide the debugging information and view it as needed.

Let’s give a small FAQ example:

 <details>
  <summary>What is HTML? </summary>
  <p>HTML is a hypertext markup language used to build the structure of a web page. </p>
</details>

<details>
  What is <summary>CSS? </summary>
  <p>CSS is a cascading style sheet that controls the appearance and layout of a web page. </p>
</details>

Basically that's it. As long as you master the basic structure and style control methods, you can easily create practical interactive components.

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