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Updated: 2026年5月31日

Open New Tab

Original task (JA): 新しいタブで開く

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Conclusion

Open New Tab — free browser-based HTML practice

■ What this exercise teaches リンクをtarget="_blank"で新しいタブで開くようにしてください。

Why it matters in real projects

target="_blank"で新しいタブ。rel="noopener noreferrer"でセキュリティ対策を。 Similar patterns appear daily in code review and production UI work.

Step-by-step workflow

1. Read the guide and understand the goal of "Open New Tab" 2. Review the HTML 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: target, _blank. 6. After success, continue with adjacent exercises in the same category

Core concept explained

target="_blank"で新しいタブ。rel="noopener noreferrer"でセキュリティ対策を。

Technical focus

Key HTML elements in this task: a.

Hint before you peek at the solution

aタグにtarget属性を追加。セキュリティのためrelも付けると良い。

Sample solution walkthrough

The solution uses HTML tags such as a. Check nesting and closing tags. Explanation: target="_blank"で新しいタブ。rel="noopener noreferrer"でセキュリティ対策を。 Hint recap: aタグにtarget属性を追加。セキュリティのためrelも付けると良い。

Solution code

📝 Sample code
<a href="https://example.com" target="_blank" rel="noopener noreferrer">例</a>

Common mistakes for this exact task

・Skipping the hint: aタグにtarget属性を追加。セキュリティのためrelも付けると良い。

Troubleshooting

Q: Preview does not change after Run A: Ensure you edited the HTML pane and clicked Run. Q: Looks correct but check fails A: Auto-check looks for output containing: target, _blank. 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 "Open New Tab" in your own words within 30 seconds ・Practice walking through each line of the sample solution on a whiteboard ・Be ready to discuss tags: a ・Discuss CSS properties: https ・Prepare one alternative approach and why you chose this one

What to do after you pass

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

Keywords

Free hands-on exercise covering 新しいタブで開く, html-basic, 初級, a, https, open new tab—search-friendly guide for Open New Tab.

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■ Exercise task

リンクをtarget="_blank"で新しいタブで開くようにしてください。

Hint if stuck

aタグにtarget属性を追加。セキュリティのためrelも付けると良い。

15pt

新しいタブで開く

リンクをtarget="_blank"で新しいタブで開くようにしてください。

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

"Open New Tab" is a 初級-level HTML exercise. リンクをtarget="_blank"で新しいタブで開くようにしてください。 Run it in-browser with automatic checking.

target="_blank"で新しいタブ。rel="noopener noreferrer"でセキュリティ対策を。 Similar patterns appear daily in code review and production UI work.

Pair this with the html-basic roadmap. Exercise #15 reinforces core html-basic skills.

Step-by-step workflow

  1. Read the guide and understand the goal of "Open New Tab"
  2. Review the HTML 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: target, _blank.
  6. After success, continue with adjacent exercises in the same category

How to read the sample solution

The solution uses HTML tags such as a. Check nesting and closing tags. Explanation: target="_blank"で新しいタブ。rel="noopener noreferrer"でセキュリティ対策を。 Hint recap: aタグにtarget属性を追加。セキュリティのためrelも付けると良い。

Real-world & career relevance

HTML underpins blogs, e-commerce copy, and corporate sites. Heading hierarchy and semantic markup indirectly support SEO.

Common mistakes

  • Skipping the hint: aタグにtarget属性を追加。セキュリティのためrelも付けると良い。
  • Multiple h1 on one page
  • Forgetting closing tags like </p>
  • Non-li children directly under ul
  • Omitting img alt text

Troubleshooting

Preview does not change after Run
Ensure you edited the HTML pane and clicked Run.
Looks correct but check fails
Auto-check looks for output containing: target, _blank. 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 "Open New Tab" in your own words within 30 seconds
  • Practice walking through each line of the sample solution on a whiteboard
  • Be ready to discuss tags: a
  • Discuss CSS properties: https
  • Prepare one alternative approach and why you chose this one

Glossary

h1
Top-level heading—one per page recommended.
p
Paragraph element.
a
Anchor with href for links.

Keywords covered on this page

Free hands-on exercise covering 新しいタブで開く, html-basic, 初級, a, https, open new tab—search-friendly guide for Open New Tab.

Related dev tools

Learning roadmap

Learning roadmap →

Related exercises

Frequently asked questions

Is "新しいタブで開く" free?

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

Difficulty and time?

"新しいタブで開く" 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 "新しいタブで開く"?

target="_blank"で新しいタブ。rel="noopener noreferrer"でセキュリティ対策を。 Hint: aタグにtarget属性を追加。セキュリティのためrelも付けると良い。

Where does html-basic fit?

HTML underpins blogs, e-commerce copy, and corporate sites. Heading hierarchy and semantic markup indirectly support SEO.

Step-by-step for "Open New Tab"?

1. Read the guide and understand the goal of "Open New Tab"
2. Review the HTML 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: target, _blank.
6. After success, continue with adjacent exercises in the same category

How to read the sample solution?

The solution uses HTML tags such as a. Check nesting and closing tags.

Explanation: target="_blank"で新しいタブ。rel="noopener noreferrer"でセキュリティ対策を。

Hint recap: aタグにtarget属性を追加。セキュリティのためrelも付けると良い。

Something is not working?

Preview does not change after Run → Ensure you edited the HTML pane and clicked Run.
Looks correct but check fails → Auto-check looks for output containing: target, _blank. 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 "Open New Tab" in your own words within 30 seconds Practice walking through each line of the sample solution on a whiteboard Be ready to discuss tags: a Discuss CSS properties: https Prepare one alternative approach and why you chose this one

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.