Checks that an icon is defined in the HTML for the 16x16 size.
This particular test has been retired because it is now obsolete. As the internet and web browsers evolve, some tests become irrelevant and new tests become necessary. ValidBot continually adjusts it's tests to represent the current best practices.
The favicon.ico file is a legacy format that you should include, but for modern web browsers it is better to provide an optimized PNG image. You can do this by including a <link> tag in the <head> of the webpage. The website should define several different sizes for different purposes. One of those sizes is the 16x16 pixel size. The following code is our recommendation.
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
This test will check for the presence of a <link> tag with the appropriate size and then download the image to make sure it is the proper size and format.
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