HTML basics · Lesson 11 of 12 · 7 minutes

HTML basics: Data attributes

data-* attributes store page-specific information without pretending that it is visible text or a standard HTML behavior.

Open the lab Course map

Mastery 0/3Run itExplain itApply it

Current edit

PreviewNo external resources

Your objectives

Hints are always available. Wrong turns never cost XP.

1
Build data attributes
Build this first target: <article>; <h1> inside <article> containing “Log review”. Inspect the structure before checking the lesson.
Hint & worked example
data-* attributes store page-specific information without pretending that it is visible text or a standard HTML behavior.
The requested elements, attributes, content, and hierarchy exist outside comments.
```
<article><h1>Log review</h1></article>
```
Common mistake to avoid: A visual appearance alone guarantees the intended HTML meaning.
2
Extend the data attributes example
Extend your file to include: <article> (data-lesson="log-review"); <h1> inside <article> containing “Log review”. Inspect the structure before checking the lesson.
Hint & worked example
data-* attributes store page-specific information without pretending that it is visible text or a standard HTML behavior.
The requested elements, attributes, content, and hierarchy exist outside comments.
```
<article data-lesson="log-review"><h1>Log review</h1></article>
```
Common mistake to avoid: Replacing semantic elements with generic divs automatically improves accessibility.
3
Verify the complete data attributes pattern
Finish the pattern with: <article> (data-lesson="log-review", data-level="beginner"); <h1> inside <article> containing “Log review”; <p> inside <article> containing “Inspect a short incident log.”. Inspect the structure before checking the lesson.
Hint & worked example
data-* attributes store page-specific information without pretending that it is visible text or a standard HTML behavior.
The requested elements, attributes, content, and hierarchy exist outside comments.
```
<article data-lesson="log-review" data-level="beginner"><h1>Log review</h1><p>Inspect a short incident log.</p></article>
```
Common mistake to avoid: A visual appearance alone guarantees the intended HTML meaning.

Understand the pattern

data-* attributes store page-specific information without pretending that it is visible text or a standard HTML behavior.

Misconceptions to reject

A visual appearance alone guarantees the intended HTML meaning.
Replacing semantic elements with generic divs automatically improves accessibility.

The preview is a sanitized subset, not a full browser compatibility test.

Worked example and expected result

<article data-lesson="log-review" data-level="beginner"><h1>Log review</h1><p>Inspect a short incident log.</p></article>

data-* attributes store page-specific information without pretending that it is visible text or a standard HTML behavior.

Try a variation

Adapt the final example to a different project name while retaining its structure and relationships. A different context still needs a real browser and accessibility check.

Explain it

Which statement correctly explains data attributes?data-* attributes store page-specific information without pretending that it is visible text or a standard HTML behavior.A visual appearance alone guarantees the intended HTML meaning.Replacing semantic elements with generic divs automatically improves accessibility.

Apply it elsewhere

You reuse data attributes in a different project. What must still be verified?Nothing; passing a single exercise guarantees every future use.Only whether the source code has the same number of lines.The meaning, relationships, and accessible names in the new document.

Keep the momentum.

Complete the lab, then explain and apply the pattern.

Next: HTML basics: Reusable class names Try an incident drill

Anonymous lesson and mastery progress lasts for this session. Sign in to keep synced lesson XP between sessions; mastery stays device-local. No speed bonus, lost lives, or hint penalties.

Keep learning

MDN: HTML structure