Emojis are characters from the UTF-8 character set:
Emoji
Value
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Try it »Full HTML Emoji Reference
HTML Emojis Examples
HTML Emoji Transport Symbols
HTML Emoji Office Symbols
HTML Emoji People Symbols
HTML Emoji Animals Symbols
What are Emojis?
Emojis look like images, or icons, but they are not.
They are letters (characters) from the UTF-8 (Unicode) character set.
UTF-8 covers almost all of the characters and symbols in the world.
The HTML charset Attribute
To display an HTML page correctly, a web browser must know the character set used in the page.
This is specified in the <meta> tag:
<meta charset="UTF-8">
If not specified, UTF-8 is the default character set in HTML.
UTF-8 Characters
Many UTF-8 characters cannot be typed on a keyboard,
but they can always be displayed using numbers (called entity numbers):
A is 65
B is 66
C is 67
Example
<!DOCTYPE html>
<html>
<meta charset="UTF-8">
<body>
<p>I will display A B C</p>
<p>I will display A B C</p>
</body>
</html>
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Example Explained
The <meta charset="UTF-8"> element defines the character set.
The characters A, B, and C, are displayed by the numbers 65, 66, and 67.
To let the browser understand that you are displaying a character, you must start the entity number
with &# and end it with ; (semicolon).
Emoji Characters
Emojis are also characters from the UTF-8 alphabet:
is 128516 is 128525 is 128151Example
<!DOCTYPE html>
<html>
<meta charset="UTF-8">
<body>
<h1>My First Emoji</h1>
<p>
</p></body></html>
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Since Emojis are characters, they can be copied, displayed,
and sized just like any other character in HTML.
Example
<!DOCTYPE html>
<html>
<meta charset="UTF-8">
<body>
<h1>Sized Emojis</h1>
<p style="font-size:48px">
</p></body></html>
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+1
Reference: https://www.w3schools.com/html/html_emojis.asp