Range: node offsets should be unsigned.

third_party/WebKit/Source/core/dom/Range.idl

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 // https://dom.spec.whatwg.org/#interface-range
-
-// FIXME: All long types in this interface should be unsigned long.
 [
     Constructor,
     ConstructorCallWith=Document,
 ] interface Range {
     readonly attribute Node startContainer;
-    readonly attribute long startOffset;
+    readonly attribute unsigned long startOffset;
     readonly attribute Node endContainer;
-    readonly attribute long endOffset;
+    readonly attribute unsigned long endOffset;
     readonly attribute boolean collapsed;
     readonly attribute Node commonAncestorContainer;
 
-    [RaisesException] void setStart(Node node, long offset);
-    [RaisesException] void setEnd(Node node, long offset);
+    [RaisesException] void setStart(Node node, unsigned long offset);
+    [RaisesException] void setEnd(Node node, unsigned long offset);
     [RaisesException] void setStartBefore(Node node);
     [RaisesException] void setStartAfter(Node node);
     [RaisesException] void setEndBefore(Node node);
     [RaisesException] void setEndAfter(Node node);
     void collapse(optional boolean toStart = false);
     [RaisesException] void selectNode(Node node);
     [RaisesException] void selectNodeContents(Node node);
 
     const unsigned short START_TO_START = 0;
     const unsigned short START_TO_END = 1;
     const unsigned short END_TO_END = 2;
     const unsigned short END_TO_START = 3;
     [RaisesException] short compareBoundaryPoints(unsigned short how, Range sourceRange);
 
     [RaisesException, CEReactions, CustomElementCallbacks] void deleteContents();
     [NewObject, RaisesException, CEReactions, CustomElementCallbacks] DocumentFragment extractContents();
     [NewObject, RaisesException, CEReactions, CustomElementCallbacks] DocumentFragment cloneContents();
     [RaisesException, CEReactions, CustomElementCallbacks] void insertNode(Node node);
     [RaisesException, CEReactions, CustomElementCallbacks] void surroundContents(Node newParent);
 
     [NewObject] Range cloneRange();
     [MeasureAs=RangeDetach] void detach();
 
-    [RaisesException] boolean isPointInRange(Node node, long offset);
-    [RaisesException] short comparePoint(Node node, long offset);
+    [RaisesException] boolean isPointInRange(Node node, unsigned long offset);
+    [RaisesException] short comparePoint(Node node, unsigned long offset);
 
     [RaisesException] boolean intersectsNode(Node node);
 
     stringifier;
 
     // CSSOM View Module
     // https://dev.w3.org/csswg/cssom-view/#extensions-to-the-range-interface
     // FIXME: getClientRect() and getBoundingClientRect() should
     // return DOMRectList and DOMRect respectively.
     ClientRectList getClientRects();
     ClientRect getBoundingClientRect();
 
     // DOM Parsing and Serialization
     // https://w3c.github.io/DOM-Parsing/#extensions-to-the-range-interface
     [NewObject, RaisesException, CEReactions, CustomElementCallbacks] DocumentFragment createContextualFragment(DOMString fragment);
 
     // Non-standard API
     [RaisesException, DeprecateAs=RangeExpand] void expand([Default=Undefined] optional DOMString unit);
 };