Navboxes and other templates using the navbox or vertical-navbox attributes are not displayed on the Mobile Web site for Wikipedia, which accounts for approximately 45% of readers.

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Usage

Place this template on templates that directly or indirectly use the navbox attribute, so that editors will know that many readers will not be able to see the template.

See https://vital-signs.wmflabs.org/#projects=enwiki/metrics=Pageviews if you want to update the numbers (try smoothing the curve by averaging over the last 90 days).