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Updated: 2026年5月31日

Display Image

Original task (JA): 画像を表示

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Conclusion

Display Image — free browser-based HTML practice

■ What this exercise teaches https://placehold.co/200x100 の画像を表示してください。altは「サンプル画像」にします。

Why it matters in real projects

imgは自己閉じタグです。srcに画像URL、altに代替テキスト（アクセシビリティ用）を指定します。 Similar patterns appear daily in code review and production UI work.

Step-by-step workflow

1. Read the guide and understand the goal of "Display Image" 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: <img. 6. After success, continue with adjacent exercises in the same category

Core concept explained

imgは自己閉じタグです。srcに画像URL、altに代替テキスト（アクセシビリティ用）を指定します。

Technical focus

Key HTML elements in this task: img.

Hint before you peek at the solution

imgタグを使います。srcとaltが必須です。

Sample solution walkthrough

The solution uses HTML tags such as img. Check nesting and closing tags. Explanation: imgは自己閉じタグです。srcに画像URL、altに代替テキスト（アクセシビリティ用）を指定します。 Hint recap: imgタグを使います。srcとaltが必須です。

Solution code

📝 Sample code
<img src="https://placehold.co/200x100" alt="サンプル画像">

Common mistakes for this exact task

・Skipping the hint: imgタグを使います。srcとaltが必須です。

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: <img. 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 "Display Image" in your own words within 30 seconds ・Practice walking through each line of the sample solution on a whiteboard ・Be ready to discuss tags: img ・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 environment track, then continue the learning roadmap at /en/learning/environment/.

Keywords

Free hands-on exercise covering 画像を表示, environment, 入門, img, https, display image—search-friendly guide for Display Image.

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■ Exercise task

https://placehold.co/200x100 の画像を表示してください。altは「サンプル画像」にします。

Hint if stuck

imgタグを使います。srcとaltが必須です。

10pt

画像を表示

https://placehold.co/200x100 の画像を表示してください。altはサンプル画像にします。

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

"Display Image" is a 入門-level HTML exercise. https://placehold.co/200x100 の画像を表示してください。altは「サンプル画像」にします。 Run it in-browser with automatic checking.

imgは自己閉じタグです。srcに画像URL、altに代替テキスト（アクセシビリティ用）を指定します。 Similar patterns appear daily in code review and production UI work.

Pair this with the environment roadmap. Exercise #5 reinforces core environment skills.

Step-by-step workflow

  1. Read the guide and understand the goal of "Display Image"
  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: <img.
  6. After success, continue with adjacent exercises in the same category

How to read the sample solution

The solution uses HTML tags such as img. Check nesting and closing tags. Explanation: imgは自己閉じタグです。srcに画像URL、altに代替テキスト（アクセシビリティ用）を指定します。 Hint recap: imgタグを使います。srcとaltが必須です。

Real-world & career relevance

Junior web and frontend training often starts with seeing HTML render in a browser. This exercise matches that first step—foundation for portfolios and landing pages.

Common mistakes

  • Skipping the hint: imgタグを使います。srcとaltが必須です。
  • Using full-width < > so HTML fails
  • Checking preview without clicking Run
  • Confusing in-browser practice with local file setup

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: <img. 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 "Display Image" in your own words within 30 seconds
  • Practice walking through each line of the sample solution on a whiteboard
  • Be ready to discuss tags: img
  • Discuss CSS properties: https
  • Prepare one alternative approach and why you chose this one

Glossary

HTML
HyperText Markup Language—structures web pages.
Browser
Software like Chrome that renders HTML.
Preview
Live view of your code output.

Keywords covered on this page

Free hands-on exercise covering 画像を表示, environment, 入門, img, https, display image—search-friendly guide for Display Image.

Related dev tools

Learning roadmap

Learning roadmap →

Related exercises

Frequently asked questions

Is "画像を表示" free?

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

Difficulty and time?

"画像を表示" is level "入門". 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 "画像を表示"?

imgは自己閉じタグです。srcに画像URL、altに代替テキスト（アクセシビリティ用）を指定します。 Hint: imgタグを使います。srcとaltが必須です。

Where does environment fit?

Junior web and frontend training often starts with seeing HTML render in a browser. This exercise matches that first step—foundation for portfolios and landing pages.

Step-by-step for "Display Image"?

1. Read the guide and understand the goal of "Display Image"
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: 6. After success, continue with adjacent exercises in the same category

How to read the sample solution?

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

Explanation: imgは自己閉じタグです。srcに画像URL、altに代替テキスト（アクセシビリティ用）を指定します。

Hint recap: imgタグを使います。srcとaltが必須です。

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: 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 "Display Image" in your own words within 30 seconds Practice walking through each line of the sample solution on a whiteboard Be ready to discuss tags: img 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?

10pt is a difficulty hint, not a score you must maximize.