how to develop our own syntax code like if, if else etc?? can any one have idea.

Answer 1

you need to study compiler theory / compiler design

else i made a mini tutorial
https://www.sololearn.com/Discuss/549601/?ref=app

else join our discord group to see in server notes
https://www.sololearn.com/Discuss/549601/?ref=app

Answer 2

For Html, React.js allows you to create custom components, so you can use it as tag name in Jsx.