ASSERTION FAILED: type() == Percent in WebCore::Length::percent

Source/core/rendering/FixedTableLayout.cpp

 /*
  * Copyright (C) 2002 Lars Knoll (knoll@kde.org)
  *           (C) 2002 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc.
  *
  * 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 120 matching lines @@
     // Iterate over the first row in case some are unspecified.
     RenderTableSection* section = m_table->topNonEmptySection();
     if (!section)
         return usedWidth;
 
     unsigned currentColumn = 0;
 
     RenderTableRow* firstRow = section->firstRow();
     for (RenderTableCell* cell = firstRow->firstCell(); cell; cell = cell->nextCell()) {
         Length logicalWidth = cell->styleOrColLogicalWidth();
+
+        // FIXME: calc() on tables should be handled consistently with other lengths. See bug: https://crbug.com/382725
+        if (logicalWidth.isCalculated())
+            logicalWidth = Length(); // Make it Auto
+
         unsigned span = cell->colSpan();
         int fixedBorderBoxLogicalWidth = 0;
         // FIXME: Support other length types. If the width is non-auto, it should probably just use
         // RenderBox::computeLogicalWidthUsing to compute the width.
         if (logicalWidth.isFixed() && logicalWidth.isPositive()) {
             fixedBorderBoxLogicalWidth = cell->adjustBorderBoxLogicalWidthForBoxSizing(logicalWidth.value());
             logicalWidth.setValue(fixedBorderBoxLogicalWidth);
         }
 
         unsigned usedSpan = 0;
@@ skipping 172 matching lines @@
             RenderTableRow* row = section->rowRendererAt(i);
             if (!row)
                 continue;
             for (RenderTableCell* cell = row->firstCell(); cell; cell = cell->nextCell())
                 cell->setPreferredLogicalWidthsDirty();
         }
     }
 }
 
 } // namespace WebCore