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SEO: Google calculates the pixel width of the characters used in the title and cuts off between 472 and 482 pixels. Average character limit would be around 55 characters

If you have only a favicon.ico, put it at the root of your site. Normally you won't need to use any markup. However, it's still good practice to link to it using the example below. Today, PNG format is recommended over .ico format (dimensions: 32x32px).