Treat <table> widths of 0 as auto.

third_party/WebKit/Source/core/layout/LayoutTable.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 234 matching lines @@
 
 void LayoutTable::removeColumn(const LayoutTableCol*)
 {
     invalidateCachedColumns();
     // We don't really need to recompute our sections, but we need to update our
     // column count and whether we have a column. Currently, we only have one
     // size-fit-all flag but we may have to consider splitting it.
     setNeedsSectionRecalc();
 }
 
+bool LayoutTable::isLogicalWidthAuto() const
+{
+    Length styleLogicalWidth = style()->logicalWidth();
+    return (!styleLogicalWidth.isSpecified() || !styleLogicalWidth.isPositive()) && !styleLogicalWidth.isIntrinsic();
+}
+
 void LayoutTable::updateLogicalWidth()
 {
     recalcSectionsIfNeeded();
 
     if (isOutOfFlowPositioned()) {
         LogicalExtentComputedValues computedValues;
         computePositionedLogicalWidth(computedValues);
         setLogicalWidth(computedValues.m_extent);
         setLogicalLeft(computedValues.m_position);
         setMarginStart(computedValues.m_margins.m_start);
         setMarginEnd(computedValues.m_margins.m_end);
     }
 
     LayoutBlock* cb = containingBlock();
 
     LayoutUnit availableLogicalWidth = containingBlockLogicalWidthForContent() + (isOutOfFlowPositioned() ? cb->paddingLogicalWidth() : LayoutUnit());
     bool hasPerpendicularContainingBlock = cb->style()->isHorizontalWritingMode() != style()->isHorizontalWritingMode();
     LayoutUnit containerWidthInInlineDirection = hasPerpendicularContainingBlock ? perpendicularContainingBlockLogicalHeight() : availableLogicalWidth;
 
     Length styleLogicalWidth = style()->logicalWidth();
-    if ((styleLogicalWidth.isSpecified() && styleLogicalWidth.isPositive()) || styleLogicalWidth.isIntrinsic()) {
+    if (!isLogicalWidthAuto()) {
         setLogicalWidth(convertStyleLogicalWidthToComputedWidth(styleLogicalWidth, containerWidthInInlineDirection));
     } else {
         // Subtract out any fixed margins from our available width for auto width tables.
         LayoutUnit marginStart = minimumValueForLength(style()->marginStart(), availableLogicalWidth);
         LayoutUnit marginEnd = minimumValueForLength(style()->marginEnd(), availableLogicalWidth);
         LayoutUnit marginTotal = marginStart + marginEnd;
 
         // Subtract out our margins to get the available content width.
         LayoutUnit availableContentLogicalWidth = (containerWidthInInlineDirection - marginTotal).clampNegativeToZero();
         if (shrinkToAvoidFloats() && cb->isLayoutBlockFlow() && toLayoutBlockFlow(cb)->containsFloats() && !hasPerpendicularContainingBlock)
@@ skipping 1169 matching lines @@
 
 LayoutUnit LayoutTable::paddingRight() const
 {
     if (collapseBorders())
         return LayoutUnit();
 
     return LayoutBlock::paddingRight();
 }
 
 } // namespace blink