Changing slider values do not work properly when percent change of a step is less than one.

Source/modules/accessibility/AXNodeObject.h

 /*
  * Copyright (C) 2012, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 47 matching lines @@
 
     virtual bool computeAccessibilityIsIgnored() const override;
     virtual bool computeHasInheritedPresentationalRole() const override;
     virtual AccessibilityRole determineAccessibilityRole();
     AccessibilityRole determineAccessibilityRoleUtil();
     String accessibilityDescriptionForElements(WillBeHeapVector<RawPtrWillBeMember<Element>> &elements) const;
     void alterSliderValue(bool increase);
     String ariaAccessibilityDescription() const;
     String ariaAutoComplete() const;
     void ariaLabeledByElements(WillBeHeapVector<RawPtrWillBeMember<Element>>& elements) const;
-    void changeValueByStep(bool increase);
     AccessibilityRole determineAriaRoleAttribute() const;
     void elementsFromAttribute(WillBeHeapVector<RawPtrWillBeMember<Element>>& elements, const QualifiedName&) const;
     bool hasContentEditableAttributeSet() const;
     // This returns true if it's focusable but it's not content editable and it's not a control or ARIA control.
     bool isGenericFocusableElement() const;
     HTMLLabelElement* labelForElement(Element*) const;
     AXObject* menuButtonForMenu() const;
     Element* menuItemElementForMenu() const;
     Element* mouseButtonListener() const;
     String placeholder() const;
@@ skipping 115 matching lines @@
     virtual void selectionChanged() override final;
     virtual void textChanged() override;
     virtual void updateAccessibilityRole() override final;
 
 private:
     Node* m_node;
 
     String alternativeTextForWebArea() const;
     void alternativeText(Vector<AccessibilityText>&) const;
     void ariaLabeledByText(Vector<AccessibilityText>&) const;
-    void changeValueByPercent(float percentChange);
     float stepValueForRange() const;
     AXObject* findChildWithTagName(const HTMLQualifiedName&) const;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXNodeObject, isAXNodeObject());
 
 } // namespace blink
 
 #endif // AXNodeObject_h