Treat <table> widths of 0 as auto.

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

 /*
  * Copyright (C) 2002 Lars Knoll (knoll@kde.org)
  *           (C) 2002 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2006, 2008, 2010 Apple Inc. All rights reserved.
  *
  * 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.
  *
@@ skipping 177 matching lines @@
         if ((tw.isAuto() || tw.hasPercent()) && !table->isOutOfFlowPositioned()) {
             LayoutBlock* cb = table->containingBlock();
             while (cb && !cb->isLayoutView() && !cb->isTableCell()
                 && cb->style()->width().isAuto() && !cb->isOutOfFlowPositioned())
                 cb = cb->containingBlock();
 
             table = 0;
             if (cb && cb->isTableCell()
                 && (cb->style()->width().isAuto() || cb->style()->width().hasPercent())) {
                 LayoutTableCell* cell = toLayoutTableCell(cb);
-                if (cell->colSpan() > 1 || cell->table()->style()->width().isAuto())
+                Length tableWidth = cell->table()->style()->width();
+                if (cell->colSpan() > 1 || tableWidth.isAuto() || (tableWidth.isSpecified() && tableWidth.isZero()))

[mstensho (USE GERRIT), 2016/02/10 10:04:09]

I think this is the behavior we want.

The reason why <table style="width:0;"> is treated as auto on a general basis
can be found in LayoutTable::updateLogicalWidth():

    if ((styleLogicalWidth.isSpecified() && styleLogicalWidth.isPositive()) ||
styleLogicalWidth.isIntrinsic()) {

So maybe we could add this as a method to LayoutTable?

bool LayoutTable::isLogicalWidthAuto() { ... return
(!styleLogicalWidth.isSpecified() || !styleLogicalWidth.isPositive()) &&
!styleLogicalWidth.isIntrinsic(); }

[dgrogan, 2016/02/10 18:38:26]

Done.

                     scale = false;
                 else
                     table = cell->table();
             }
         } else {
             table = 0;
         }
     }
     return scale;
 }
@@ skipping 483 matching lines @@
             int reduce = available * minMaxDiff / logicalWidthBeyondMin;
             m_layoutStruct[i].computedLogicalWidth += reduce;
             available -= reduce;
             logicalWidthBeyondMin -= minMaxDiff;
             if (available >= 0)
                 break;
         }
     }
 }
 } // namespace blink