💡 An editor is ready below the article—experiment freely!
Updated: 2026年5月31日
Flex Wrap
Original task (JA): flex-wrap
📌
Conclusion
Flex Wrap — free browser-based HTML/CSS/JS practice
Why it matters in real projects
flex-wrap: wrapで折り返しが有効になります。 Similar patterns appear daily in code review and production UI work.Step-by-step workflow
1. Read the guide and understand the goal of "Flex Wrap" 2. Review the HTML/CSS/JS editor pane and start from the starter code 3. Open hints if stuck; compare your diff with the sample solution 4. Click Run and inspect preview/console output 5. Auto-check looks for output containing: flex-wrap, wrap. 6. After success, continue with adjacent exercises in the same categoryCore concept explained
flex-wrap: wrapで折り返しが有効になります。Technical focus
Key HTML elements in this task: div, style.Hint before you peek at the solution
flex-wrap: wrap;Sample solution walkthrough
The solution uses HTML tags such as div, style. Check nesting and closing tags. CSS properties include width, display, flex-wrap. Watch selector spelling and specificity. Explanation: flex-wrap: wrapで折り返しが有効になります。 Hint recap: flex-wrap: wrap;Solution code
📝 Sample code
<div class="w"><div style="width:200px">A</div><div style="width:200px">B</div><div style="width:200px">C</div></div>
<style>.w { display: flex; flex-wrap: wrap; }</style>Common mistakes for this exact task
・Skipping the hint: flex-wrap: wrap; ・Forgetting display:flex on the flex parent breaks alignmentTroubleshooting
Q: Preview does not change after Run A: Ensure you edited the HTML/CSS/JS pane and clicked Run. Q: Looks correct but check fails A: Auto-check looks for output containing: flex-wrap, wrap. Look for typos, full-width spaces, or unclosed tags. Q: Console shows errors A: Open DevTools Console and fix bracket/quote mismatches at the reported line. Q: Hard to type on mobile A: Use landscape mode or continue on desktop—the same URL keeps progress in localStorage.Interview / portfolio tips
・Explain the techniques in "Flex Wrap" in your own words within 30 seconds ・Practice walking through each line of the sample solution on a whiteboard ・Be ready to discuss tags: div, style ・Discuss CSS properties: width, display, flex-wrap ・Prepare one alternative approach and why you chose this oneWhat to do after you pass
Move to the next exercise in the css-layout track, then continue the learning roadmap at /en/learning/layout/.Keywords
Free hands-on exercise covering flex-wrap, css-layout, 初級, div, style, width, display, flex wrap—search-friendly guide for Flex Wrap.🧪 Try it here — safe to break things
Use the editor below to write code and preview instantly.
Jump to editor■ Exercise task
Flexboxで子要素がはみ出したら折り返すようにしてください。
Hint if stuck
flex-wrap: wrap;