This means that the URL in question contains some text which is too small, and therefore not legible for mobile devices.
If the font size is too small, it makes it difficult for mobile users to read, causing them to zoom and scroll. It is recommended to use a base font size of 12 CSS pixels on the <body> or <html> tag, anything smaller is considered illegible.
This Hint will trigger for any internal URL for which a viewport is set, and contains fonts smaller than 12 CSS pixels.
Adjust your CSS to ensure that all fonts are over 12 CSS pixels. You may feel that 12 pixels is still too small, so check readability on smaller viewports using Chrome DevTools and other emulation tools.
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