These tags may be shows the same output, but the usage of tags are varying. The following table shows the usage of this kind of tags.

While writing HTML document, we should use the appropriate tags according to its usage. If we want show a text as underlined use < u > instead of < ins >

Highlighting text :
Highlighting is an important formatting feature is used to call attention to the reader. The < mark > tag is used to highlight the text in HTML. This is also a container tag. Whatever the text given between < mark > and < /mark > will be displayed as highlighting with default color.
HTML CODE:
< html >
< head >
< title > Highlighting text < /title >
< /head >
< body >
A Computer is an < mark > electronic
< /mark > device
< /body >
< /html >

(i) Ordered List :
Indents lists having numbers or letters in front of every list item.
(ii) Unordered List:
Indents lists having a bullet symbol in front of every list item.
(iii) Definition List:
Lists showing definition terms and definition descriptions.

Attributes of Ordered List :
There are two attributes can be used to customize ordered list.
1. Type - Changing numbering style
2. Start - Changing numbering order.
Type - is used to change the number style. The default number style is standard Arabic numeral If (1,2,3 .....)

Start - is used to specify the number of letter with which start the list. The default starting point is 1. The value Of the start attribute should be a decimal number, regardless of the. numbering style being used.

(i) A Subscript is a way to display a character or a, number below the normal line of type. For example: The scientific notation for water is H₂O. It should be written as H₂O Here, 2 is appearing below the normal line. This is called subscript.
(ii) A Superscript is also a way to show a character or a number above the normal line of type. For example: The familiar algebra equation "a plus b the whole square" should be written as (a+b)² Here, the square value 2 is appearing above the normal line. This is called superscript.