vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Tables.php

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<?php

/**
 * XHTML 1.1 Tables Module, fully defines accessible table elements.
 */
class HTMLPurifier_HTMLModule_Tables extends HTMLPurifier_HTMLModule
{
    /**
     * @type string
     */
    public $name = 'Tables';

    /**
     * @param HTMLPurifier_Config $config
     */
    public function setup($config)
    {
        $this->addElement('caption', false, 'Inline', 'Common');

        $this->addElement(
            'table',
            'Block',
            new HTMLPurifier_ChildDef_Table(),
            'Common',
            array(
                'border' => 'Pixels',
                'cellpadding' => 'Length',
                'cellspacing' => 'Length',
                'frame' => 'Enum#void,above,below,hsides,lhs,rhs,vsides,box,border',
                'rules' => 'Enum#none,groups,rows,cols,all',
                'summary' => 'Text',
                'width' => 'Length'
            )
        );

        // common attributes
        $cell_align = array(
            'align' => 'Enum#left,center,right,justify,char',
            'charoff' => 'Length',
            'valign' => 'Enum#top,middle,bottom,baseline',
        );

        $cell_t = array_merge(
            array(
                'abbr' => 'Text',
                'colspan' => 'Number',
                'rowspan' => 'Number',
                // Apparently, as of HTML5 this attribute only applies
                // to 'th' elements.
                'scope' => 'Enum#row,col,rowgroup,colgroup',
            ),
            $cell_align
        );
        $this->addElement('td', false, 'Flow', 'Common', $cell_t);
        $this->addElement('th', false, 'Flow', 'Common', $cell_t);

        $this->addElement('tr', false, 'Required: td | th', 'Common', $cell_align);

        $cell_col = array_merge(
            array(