Pure CSS Hover Underline Effect

For reddit request: Anyone know what plugins were used? 

Hover over to see effect: Underline Me On Hover

See the Pen Pure CSS Underline On Hover by Acephalia (@Acephalia) on CodePen.

Hover over to see effect : Erase underline on hover

See the Pen Pure CSS Reverse Outline by Acephalia (@Acephalia) on CodePen.

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