INPUT with type="text" is rendered wider than is set in CSS style in strict mode. E.g. INPUT which was set width 200px is rendered with width 202px.
Created attachment 11322 [details] Testcase See blue div as measure.
Created attachment 11323 [details] Screenshot with description
This is not a bug. input elements use content box sizing like other HTML elements in strict mode, so the border/padding of the textfield is not counted as part of the width. You will see the same behavior in Firefox if you try it.