HTML decoding is the process of converting HTML entities back to their original characters. HTML entities are special characters that have a specific meaning in HTML and are represented by a sequence of characters starting with "&" and ending with ";".
For example, the HTML entity "<" represents the less-than symbol "<", and "&" represents the ampersand "&".
We then create a new textarea element in the document and set its innerHTML property to the encoded text. This causes the HTML entities to be automatically decoded. Finally, we retrieve the value of the textarea element, which contains the decoded text.
Note that some HTML entities are not supported in all browsers, so it's important to test your HTML decoding code on different browsers to ensure compatibility.