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Updated: 2026年5月31日

Dom Remove Element

Original task (JA): 要素を削除

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Conclusion

Dom Remove Element — free browser-based JavaScript (DOM) practice

■ What this exercise teaches idが「remove-me」の要素をDOMから削除してください。

Why it matters in real projects

remove()で要素をDOMから削除できます。 Similar patterns appear daily in code review and production UI work.

Step-by-step workflow

1. Read the guide and understand the goal of "Dom Remove Element" 2. Review the JavaScript (DOM) 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: remove, remove-me. 6. After success, continue with adjacent exercises in the same category

Core concept explained

remove()で要素をDOMから削除できます。

Technical focus

Key JavaScript APIs: document.getElementById.

Hint before you peek at the solution

element.remove() または parent.removeChild(element)

Sample solution walkthrough

JavaScript APIs used: document.getElementById. Verify spelling and async/await usage. Explanation: remove()で要素をDOMから削除できます。 Hint recap: element.remove() または parent.removeChild(element)

Solution code

📝 Sample code
document.getElementById('remove-me')?.remove();

Common mistakes for this exact task

・Skipping the hint: element.remove() または parent.removeChild(element) ・getElementById returns null if the id string differs by even one character

Troubleshooting

Q: Preview does not change after Run A: Ensure you edited the JavaScript (DOM) pane and clicked Run. Q: Looks correct but check fails A: Auto-check looks for output containing: remove, remove-me. 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 "Dom Remove Element" in your own words within 30 seconds ・Practice walking through each line of the sample solution on a whiteboard ・Connect this task to a real component you would ship ・Mention responsive or accessibility trade-offs ・Describe when you use: document.getElementById

What to do after you pass

Move to the next exercise in the dom track, then continue the learning roadmap at /en/learning/js-basic/.

Keywords

Free hands-on exercise covering 要素を削除, dom, 初級, document.getElementById, dom remove element—search-friendly guide for Dom Remove Element.

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■ Exercise task

idが「remove-me」の要素をDOMから削除してください。

Hint if stuck

element.remove() または parent.removeChild(element)

15pt

要素を削除

idがremove-meの要素をDOMから削除してください。

エラーをクリックで該当行をハイライト。✕=エラー ⚠=警告 ›=ログ。

Roadmap · All guides

Deep dive

"Dom Remove Element" is a 初級-level JavaScript (DOM) exercise. idが「remove-me」の要素をDOMから削除してください。 Run it in-browser with automatic checking.

remove()で要素をDOMから削除できます。 Similar patterns appear daily in code review and production UI work.

Pair this with the js-basic roadmap. Exercise #61 reinforces core dom skills.

Step-by-step workflow

  1. Read the guide and understand the goal of "Dom Remove Element"
  2. Review the JavaScript (DOM) 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: remove, remove-me.
  6. After success, continue with adjacent exercises in the same category

How to read the sample solution

JavaScript APIs used: document.getElementById. Verify spelling and async/await usage. Explanation: remove()で要素をDOMから削除できます。 Hint recap: element.remove() または parent.removeChild(element)

Real-world & career relevance

DOM APIs power clicks, forms, and modals—from jQuery era to modern SPAs.

Common mistakes

  • Skipping the hint: element.remove() または parent.removeChild(element)
  • getElementById returns null if the id string differs by even one character
  • Typo in getElementById
  • Using onClick instead of addEventListener
  • Setting textContent without null check

Troubleshooting

Preview does not change after Run
Ensure you edited the JavaScript (DOM) pane and clicked Run.
Looks correct but check fails
Auto-check looks for output containing: remove, remove-me. Look for typos, full-width spaces, or unclosed tags.
Console shows errors
Open DevTools Console and fix bracket/quote mismatches at the reported line.
Hard to type on mobile
Use landscape mode or continue on desktop—the same URL keeps progress in localStorage.

Interview & portfolio tips

  • Explain the techniques in "Dom Remove Element" in your own words within 30 seconds
  • Practice walking through each line of the sample solution on a whiteboard
  • Connect this task to a real component you would ship
  • Mention responsive or accessibility trade-offs
  • Describe when you use: document.getElementById

Glossary

DOM
Document Object Model—tree API for HTML.
getElementById
Fetch one element by id.
addEventListener
Register click and other events.

Keywords covered on this page

Free hands-on exercise covering 要素を削除, dom, 初級, document.getElementById, dom remove element—search-friendly guide for Dom Remove Element.

Related dev tools

Learning roadmap

Learning roadmap →

Related exercises

Frequently asked questions

Is "要素を削除" free?

This exercise is free and runs entirely in your browser. No account or credit card required.

Difficulty and time?

"要素を削除" is level "初級". Read the guide first; beginners can usually finish within 30 minutes. Allow 5–15 minutes per exercise. Use hints, then the solution if stuck.

What after a correct answer?

After a correct answer, use "Next exercise". When you finish a category, continue on the learning roadmap.

Works on mobile?

Works on mobile browsers, but typing code is easier on a desktop.

Where are other exercises?

All exercises: /en/learn/ with category filters.

Key takeaway for "要素を削除"?

remove()で要素をDOMから削除できます。 Hint: element.remove() または parent.removeChild(element)

Where does dom fit?

DOM APIs power clicks, forms, and modals—from jQuery era to modern SPAs.

Step-by-step for "Dom Remove Element"?

1. Read the guide and understand the goal of "Dom Remove Element"
2. Review the JavaScript (DOM) 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: remove, remove-me.
6. After success, continue with adjacent exercises in the same category

How to read the sample solution?

JavaScript APIs used: document.getElementById. Verify spelling and async/await usage.

Explanation: remove()で要素をDOMから削除できます。

Hint recap: element.remove() または parent.removeChild(element)

Something is not working?

Preview does not change after Run → Ensure you edited the JavaScript (DOM) pane and clicked Run.
Looks correct but check fails → Auto-check looks for output containing: remove, remove-me. Look for typos, full-width spaces, or unclosed tags.
Console shows errors → Open DevTools Console and fix bracket/quote mismatches at the reported line.
Hard to type on mobile → Use landscape mode or continue on desktop—the same URL keeps progress in localStorage.

Career / interview angle?

Explain the techniques in "Dom Remove Element" in your own words within 30 seconds Practice walking through each line of the sample solution on a whiteboard Connect this task to a real component you would ship Mention responsive or accessibility trade-offs Describe when you use: document.getElementById

Can I change the starter code?

Yes—if it works. Understanding the starter first, then adding minimal diffs, speeds up learning.

What do the points mean?

15pt is a difficulty hint, not a score you must maximize.