AccessibilityObject* AccessibilityTableColumn::headerObject()
{
if (!m_parent)
return nullptr;
RenderObject* renderer = m_parent->renderer();
if (!renderer)
return nullptr;
if (!is<AccessibilityTable>(*m_parent))
return nullptr;
auto& parentTable = downcast<AccessibilityTable>(*m_parent);
if (!parentTable.isExposableThroughAccessibility())
return nullptr;
if (parentTable.isAriaTable()) {
for (const auto& cell : children()) {
if (cell->ariaRoleAttribute() == ColumnHeaderRole)
return cell.get();
}
return nullptr;
}
if (!is<RenderTable>(*renderer))
return nullptr;
RenderTable& table = downcast<RenderTable>(*renderer);
// try the <thead> section first. this doesn't require th tags
if (auto* headerObject = headerObjectForSection(table.header(), false))
return headerObject;
RenderTableSection* bodySection = table.firstBody();
while (bodySection && bodySection->isAnonymous())
bodySection = table.sectionBelow(bodySection, SkipEmptySections);
// now try for <th> tags in the first body. If the first body is
return headerObjectForSection(bodySection, true);
}
