HTML - Tag

HTML  tag defines inline content that should be rendered as subscript. Subscripts typically appear with a lower baseline and smaller font. Subscript text is commonly used for chemical formulas, like H20, which is written as H₂O.

The element should be used for typographical reasons that is, to adjust the position of the text to comply with typographical rules or standards rather than for presentation or appearance.

Syntax

<sub>.....</sub>

Attribute

HTML sub tag supports Global and Event attributes of HTML. A specific attribtes is accepted as well which is listed below.

Examples of HTML sub Tag

Bellow examples will illustrate the usage of sub tag, where, when and how to use it to create subscript content.

Creating subscript element using sub tag

Creating a subscript text in between a sentence which can let you understand the role of sub tag. In the following example, we are creating an HTML document and using the tag to display text in subscript forms.

<!DOCTYPE html>
<html>
<body>
   <h1>The sub tag</h1>
   <p> This is normal para </p>
   <p> this is <sub> subscript </sub> para </p>
</body>
</html>

Chemical formula using sub tag

Mostly we use sub tag to represent chemical formulas, mathematical equations where sub and sup tag can be use. Here we are using sub tag to create a subscript element. We are creating an HTML document and using the tag to display the chemical formula.

<!DOCTYPE html>
<html>
<body>
   <h1>The sub tag</h1>
   <p> 
      Almost every developer's favorite molecule is C 
      <sub>8</sub>H <sub>10</sub>N <sub>4</sub>O <sub>2</sub>, 
      which is commonly known as "caffeine." </p>
</body>
</html>

Styling subscript element using CSS

We can style subscript element as we want, to create a subscript element we use HTML tag which can be selected in CSS to style that element. Following is the example, where we are going to use the tag to display the mathematics variable subscripts (such as distances along the same axis).

<!DOCTYPE html>
<html>
<head>
   <style>
      sub {
         color: red;
      }
   </style>
</head>
<body>
   <h1>The sub tag</h1>
   <p> 
      The horizontal coordinates' positions 
      along the X-axis are represented as 
      <var>x <sub>1</sub> </var> … <var>x <sub>n</sub> </var>. 
   </p>
</body>
</html>