text-transform

p.test { text-transform: none;}
p.test1 { text-transform: lowercase;}
p.test2 { text-transform: uppercase;}
p.test3 { text-transform: capitalize;}

Value	Description
none	Displays the text exactly as entered. This 'none' is the initial value.
lowercase	Displays all text in lowercase.
uppercase	Displays all text in uppercase.
capitalize	Displays the first letter of each word in uppercase.

<p style="text-transform: none;">This is a p element. this is a pen.</p>

<p style="text-transform: lowercase;">This is a p element. this is a pen.</p>

<p style="text-transform: uppercase;">This is a p element. this is a pen.</p>

<p style="text-transform: capitalize;">This is a p element. this is a pen.</p>

※ Version data is based on MDN.

Specifies the capitalization of text such as alphabetic characters.

Languages such as Japanese do not have the concept of uppercase and lowercase, so specifying this property on Japanese text will have no effect. Please be aware of this.