WordPress at a glance
function is not described

WP_Query::is_favicon() public WP 5.4.0

Is the query for the favicon.ico file?

It's a method of the class: WP_Query{}

No Hooks.

Return

true/false. Whether the query is for the favicon.ico file.

Usage

$WP_Query = new WP_Query();
$WP_Query->is_favicon();

Changelog

Since 5.4.0 Introduced.

Code of WP_Query::is_favicon() WP 5.5.1

<?php
public function is_favicon() {
	return (bool) $this->is_favicon;
}