This heading will be affected

This heading will not be affected since center1 is a paragraph specific class

I am using a class and while using a class I can specify more than one class

I am a paragraph using id named create

I am a paragraph using two ids which will not work as I can specify two classes at a time but not two ids

I am a paragraph again using the same id which is said to be used in a page for exactly once but see I still work and i will work for next everytime you use me but while You will use javascript, the code can malfunction.Also, It may cause your page to fail validation.So use Id only once in a page.

Id can also be element specific. So formatting will work here too.

I am giving a class and an id too,No matter in what order you gave the instruction, id will always overpower the class

I am giving two classes having different color definitions,The last read class from the head like center comes after the _1center class will overpower that property

See by switching their positions in class tag now. The way you give the names in the class attribute makes no difference, What matters is the order in the head part of your document

I will work only for the word: SoloLearn

I will not work here as You didn't specified class for me even you enclosed me in the id tag

I will not work here as You didn't enclosed my class in my id descendant

This heading will appear purple as you marked it important which has the highest priority and hence will not appear in green color as specified by the class center

I am a member of grouped selectors.

This heading will be affected

This heading will not be affected since center1 is a paragraph specific class

This heading will appear purple as you marked it important which has the highest priority and hence will not appear in green color as specified by the class center

I am also a part of grouped selectors.

Css selectors(valid class and id names)