What Fractional Part is Shaded? (1)

Creation of this applet was inspired by a [url=https://twitter.com/solvemymaths/status/977247282780307458]tweet[/url] from [url=https://twitter.com/solvemymaths]Ed Southall[/url] (Twitter: @solvemymaths). [br][br]Click on the link to the tweet in the sentence above. [br][b][color=#ff00ff]Can you answer this question without sliding the slider in the applet below? [/color][/b]

Information: What Fractional Part is Shaded? (1)