- 01Setting Up (What You'll Need)
- 02Your First HTML
- 03Lists and Links
- 04Adding Color with CSS
- 05CSS Selectors and Classes
- 06Layout with Flexbox
- 07Trying Out Images and Tables
- 08Trying Out Form Controls
- 09Understanding the Box Model
- 10Intro to Responsive Design (Media Queries)
- 11CSS Variables (Custom Properties)
- 12Layout with CSS Grid
- 13Adding an Animation
- 14How to Write Comments
- 15Adding Interaction with Pseudo-Classes (:hover)
- 16CSS's :not() and Multi-Condition Selectors
- 17The Basics of Meta Tags and SEO
- 18The Basics of Accessibility (alt and aria-label)
- 19Trying Out data Attributes (data-*)
- 20CSS Transitions (Smooth Hover Changes)
- 21iframe (Embedding Another Page)
- 22position (Precisely Positioning an Element)
- 23z-index (Specifying Stacking Order)
- 24The Basics of localStorage (Saving Data in the Browser)
- 25The video and audio Tags (Embedding Media)
- 26Advanced Tables (colspan and rowspan)
- 27The Basics of CSS Specificity
- 28The Basics of SVG (Drawing Vector Images)
- 29Advanced Flexbox (Wrapping and Growing)
- 30Form Validation (required and pattern)
- 31Advanced CSS Grid (grid-template-areas)
- 32The details and summary Tags (Building a Collapsible Panel)
- 33CSS Counters (Automatic Numbering)
- 34Fluid Font Sizes with clamp()
- 35prefers-color-scheme (Dark Mode Support)
- 36Building a Slider with input type=range
- 37Fixing an Aspect Ratio with aspect-ratio
- 38Adjusting How an Image Displays with object-fit
- 39Rotating and Scaling with transform
- 40Serving Responsive Images with the picture Tag
- 41Showing Keyboard Focus with :focus-visible
- 42Scrolling Smoothly with scroll-behavior
- 43Switching Layouts Per-Component with Container Queries
- 44Creating a Frosted-Glass Effect with backdrop-filter
- 45Building a Flexible Grid with repeat() and minmax()
- 46Fixing a Header in Place with position: sticky
- 47Adding Pseudo-Elements with ::before and ::after
- 48Truncating Long Text with an Ellipsis Using text-overflow
- 49Using a Calculated Value in CSS with calc()
- 50[Applied] Build a Simple Website
The details and summary Tags (Building a Collapsible Panel)
In this lesson you'll learn how to build a collapsible panel using the details and summary tags, so you can achieve an accordion UI without JavaScript. This is for people searching "HTML details summary usage."
Combining <details> and <summary> lets you build a click-to-expand "accordion panel" without writing any JavaScript. This is used on things like a frequently-asked-questions (FAQ) page.
The sample code prepares two <details> blocks, each with a question in its <summary> and an answer <p> inside it. Try actually clicking on one, and confirm how the browser automatically provides an expand/collapse icon and motion.
A common beginner stumbling block is how to customize the expand/collapse appearance with your own design. To remove or change the browser's default triangle icon, you need to adjust the <summary>'s list-style or a pseudo-element — it takes a bit of extra work.
Whatever's written in <summary> always stays visible, and clicking it expands or collapses the contents of <details>. Since this is a standard browser feature, its advantage is being able to easily implement a collapsible display without any extra code.
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