INPUT element: Updating 'step' attribute should adjust the last value.

third_party/WebKit/LayoutTests/fast/forms/range/range-set-attribute.html

Index: third_party/WebKit/LayoutTests/fast/forms/range/range-set-attribute.html
diff --git a/third_party/WebKit/LayoutTests/fast/forms/range/range-set-attribute.html b/third_party/WebKit/LayoutTests/fast/forms/range/range-set-attribute.html
index 6547d5132553974e02620eee4e3be681e55bf5b5..23ccbf0ae0701c94d226e45b35e2b4cb1c9acc63 100644
--- a/third_party/WebKit/LayoutTests/fast/forms/range/range-set-attribute.html
+++ b/third_party/WebKit/LayoutTests/fast/forms/range/range-set-attribute.html
@@ -25,6 +25,14 @@ shouldBe('input.setAttribute("max", "10"); input.value', '"10"');
 
 debug("value attribute should not change the value after you set a value")
 shouldBe('input.value = 10; input.setAttribute("value", "5"); input.value', '"10"');
+
+debug('Updating step attribute should adjust the last value.');
+input = document.createElement('input');
+input.type = 'range';
+input.step = '10';
+shouldBeEqualToString('input.value', '50');
+shouldBeEqualToString('input.step = "15"; input.value', '45');
+shouldBeEqualToString('input.step = "20"; input.value', '40');
 </script>
 </body>
 </html>