The sub() method of String values creates a string that embeds this string in a
element (<sub>str</sub>), which causes this string to be displayed as subscript.
Note: All HTML wrapper methods are deprecated and only standardized for compatibility purposes. Use DOM APIs such as
document.createElement()instead.
Syntax
sub()
Parameters
None.
Return value
A string beginning with a <sub> start tag, then the text str, and then a </sub> end tag.
Examples
Using sub()
The code below creates an HTML string and then replaces the document's body with it:
const contentString = "Hello, world";
document.body.innerHTML = contentString.sub();
This will create the following HTML:
<sub>Hello, world</sub>
Instead of using sub() and creating HTML text directly, you should use DOM APIs such as document.createElement(). For example:
const contentString = "Hello, world";
const elem = document.createElement("sub");
elem.innerText = contentString;
document.body.appendChild(elem);