third_party/WebKit/LayoutTests/fast/layers/script-tests/negative-scroll-positions.js

   1 description(
   2 "This tests that negative scrollTop and scrollLeft values are clamped to zero."
   3 );
   4
   5 var scroller = document.createElement('div');
   6 scroller.id = 'scroller';
   7 scroller.style.overflow = 'scroll';
   8 scroller.style.width = '200px';
   9 scroller.style.height = '200px';
  10
  11 var contents = document.createElement('div');
  12 contents.style.width = '400px';
  13 contents.style.height = '400px';
  14
  15 scroller.appendChild(contents);
  16 document.body.appendChild(scroller);
  17
  18 function attemptScroll(x, y)
  19 {
  20   scroller.scrollTop = x;
  21   scroller.scrollLeft = y;
  22   return scroller.scrollTop + ',' + scroller.scrollLeft;
  23 }
  24
  25 shouldBe("attemptScroll(0, 0)", "'0,0'");
  26 shouldBe("attemptScroll(50, 50)", "'50,50'");
  27 shouldBe("attemptScroll(-50, -50)", "'0,0'");