HTML - How to show an Unicode Character in HTML

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How to show a unicode character in HTML.

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Example

Example with the grinning face emoji. This character has the unicode value:

• 1F600 in hexadecimal
• or 128512 in decimal

<p>In hexadecimal, I will write: &#x1F600; to show a grinning face</p>
<p>In decimal, I will write: &#128512; to show a grinning face</p>

Output: