_{: The SUB Element}

Last updated: 2026-09-12

<sub>The SUB Element

Defines subscript text shown below the baseline, used in chemical formulas (e.g. H₂O) and math notation.

Category	Formatting
Content Model	Phrasing content
Allowed Parents	Any element that accepts phrasing content
Content Tag	Yes — requires closing `</sub>` tag
Status	Standard

📝 Syntax

<sub>subscript</sub>

See all global attributes → See all event attributes →

▶ Example

Edit the code below and see the live result in the playground:

▶ Try it

🌐 Browser Support

Browser	Chrome	Edge	Firefox	Safari	Opera
<sub>	✓ v1	✓ v12	✓ v1	✓ v1	✓ v1
Supported in all major browsers

Tip： Subscript changes line height; use sparingly in long text to avoid uneven spacing.

<sub> — formatting tutorial

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: The SUB Element

<sub>The SUB Element

📝 Syntax

▶ Example

🌐 Browser Support

🏷️ Related Tags

💡 Related Cases

📚 Related Tutorials

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_{: The SUB Element}