JavaScript Reference
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Quick Reference

The Element innerHTML property sets or returns the HTML content of an element.

<!-- output to the HTML element -->
<p id="my_output">My content</p>

Get HTML content:

// variable
let my_html = document.getElementById('my_content').innerHTML;

// output to the HTML element
document.getElementById('my_output').innerHTML = my_html;

Set HTML content:

document.getElementById('my_output').innerHTML = 'New content';

Output

Get HTML content:

My content

Set HTML content:

(no output; HTML content is changed to "New content")

Syntax

Get HTML content:

element.innerHTML

Set HTML content:

element.innerHTML = text

JavaScript Notes:

  • When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
  • JavaScript is a case-sensitive language; firstName is NOT the same as firstname
  • Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
  • JavaScript variables must begin with a letter, $, or _
  • JavaScript variables are case sensitive (x is not the same as X)
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