Answer 1

"cursive" is a generic name for a font type: There are different cursive fonts, and when you only write "cursive" it will fall back to whatever the browser chooses as cursive font.

They list a few examples of cursive fonts here:
https://developer.mozilla.org/en-US/docs/Web/CSS/font-family

Answer 2

Harsh
Times New Roman is not a cursive font, so it will not work.
Perhaps you can use Google fonts and use a font you like.

Answer 3

add or remove a css class.

Answer 4

Brush Script MT is a choice, but if you can access google fonts, there are other better options.

https://www.w3schools.com/cssref/css_websafe_fonts.php

Answer 5

or maybe you mean a css shorthand?

<p style="font: 30px Arial, sans-serif;">Hello</p>
<p style="font:italic small-caps bold 25px/30px Georgia, serif">Hello</p>

https://www.w3schools.com/css/css_font_shorthand.asp