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Updated: 2026年5月31日
Flex Space Between
Original task (JA): space-between
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Conclusion
Flex Space Between — free browser-based HTML/CSS/JS practice
Why it matters in real projects
space-betweenで先頭と末尾を端に、間を均等にします。 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 Space Between" 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: space-between. 6. After success, continue with adjacent exercises in the same categoryCore concept explained
space-betweenで先頭と末尾を端に、間を均等にします。Technical focus
Key HTML elements in this task: div, span, style.Hint before you peek at the solution
justify-content: space-between;Sample solution walkthrough
The solution uses HTML tags such as div, span, style. Check nesting and closing tags. CSS properties include display, justify-content, width. Watch selector spelling and specificity. Explanation: space-betweenで先頭と末尾を端に、間を均等にします。 Hint recap: justify-content: space-between;Solution code
📝 Sample code
<div class="sb"><span>左</span><span>右</span></div>
<style>.sb { display: flex; justify-content: space-between; width: 100%; }</style>Common mistakes for this exact task
・Skipping the hint: justify-content: space-between; ・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: space-between. 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 Space Between" 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, span, style ・Discuss CSS properties: display, justify-content, width ・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 space-between, css-layout, 初級, div, span, style, display, justify-content, width, flex space between—search-friendly guide for Flex Space Between.🧪 Try it here — safe to break things
Use the editor below to write code and preview instantly.
Jump to editor■ Exercise task
Flexboxで子要素を両端寄せ（間に均等スペース）にしてください。
Hint if stuck
justify-content: space-between;