Stripping all tags inside a <table> tag

[sgilberg]

Hi, I have configured purifier to allow all table-related tags, but when I run clean() on such html, everything inside of the <table> tag is removed except the text itself. Notably, these results are inconsistent with the HTML Purifier's live demo results, using the same configuration, which is why I'm wondering if there is an issue specific to this package. Am I missing something?

My full configuration:

return [
    'encoding'      => 'UTF-8',
    'finalize'      => true,
    'cachePath'     => storage_path('app/purifier'),
    'cacheFileMode' => 0755,
    'settings'      => [
        'default' => [
            'HTML.Doctype'             => 'HTML 4.01 Transitional',
            'HTML.Allowed'             => 'div,b,strong,i,em,a[href|title|target],ul,ol,li,p[style],br,span[style|class],img[width|height|alt|src|style],h1,h2,h3,h4,h5,blockquote,table[cellpadding|cellspacing|style|class],thead,tbody,tr,th,td',
            'CSS.AllowedProperties'    => 'font,font-size,font-weight,font-style,font-family,text-decoration,padding-left,color,background-color,text-align,width',
            'Attr.AllowedFrameTargets' => ['_blank'],
            'AutoFormat.AutoParagraph' => false,
            'AutoFormat.RemoveEmpty'   => true,
        ],
        'test'    => [
            'Attr.EnableID' => true
        ],
        "youtube" => [
            "HTML.SafeIframe"      => 'true',
            "URI.SafeIframeRegexp" => "%^(http://|https://|//)(www.youtube.com/embed/|player.vimeo.com/video/)%",
        ],
        'custom_definition' => [
            'id'  => 'html5-definitions',
            'rev' => 1,
            'debug' => false,
            'elements' => [
                // http://developers.whatwg.org/sections.html
                ['section', 'Block', 'Flow', 'Common'],
                ['nav',     'Block', 'Flow', 'Common'],
                ['article', 'Block', 'Flow', 'Common'],
                ['aside',   'Block', 'Flow', 'Common'],
                ['header',  'Block', 'Flow', 'Common'],
                ['footer',  'Block', 'Flow', 'Common'],
                ['table',  'Block', 'Flow', 'Common'],

                // Content model actually excludes several tags, not modelled here
                ['address', 'Block', 'Flow', 'Common'],
                ['hgroup', 'Block', 'Required: h2 | h3 | h4 | h5 | h6', 'Common'],

                // http://developers.whatwg.org/grouping-content.html
                ['figure', 'Block', 'Optional: (figcaption, Flow) | (Flow, figcaption) | Flow', 'Common'],
                ['figcaption', 'Inline', 'Flow', 'Common'],

                // http://developers.whatwg.org/the-video-element.html#the-video-element
                ['video', 'Block', 'Optional: (source, Flow) | (Flow, source) | Flow', 'Common', [
                    'src' => 'URI',
                    'type' => 'Text',
                    'width' => 'Length',
                    'height' => 'Length',
                    'poster' => 'URI',
                    'preload' => 'Enum#auto,metadata,none',
                    'controls' => 'Bool',
                ]],
                ['source', 'Block', 'Flow', 'Common', [
                    'src' => 'URI',
                    'type' => 'Text',
                ]],
                ['object', 'Block', 'Optional: (source, Flow) | (Flow, source) | Flow', 'Common', [
                    'data' => 'URI',
                    'form' => 'Text',
                    'name' => 'Text',
                    'usemap' => 'Text',
                    'type' => 'Text',
                    'width' => 'Length',
                    'height' => 'Length',
                ]],
                ['iframe', 'Block', 'Optional: (source, Flow) | (Flow, source) | Flow', 'Common', [
                    'src' => 'URI',
                    'name' => 'Text',
                    'class' => 'Text',
                    'usemap' => 'Text',
                    'width' => 'Length',
                    'height' => 'Length',
                ]],
                ['embed', 'Block', 'Optional: (source, Flow) | (Flow, source) | Flow', 'Common', [
                    'src' => 'URI',
                    'type' => 'Text',
                    'width' => 'Length',
                    'height' => 'Length',
                ]],

                //
                ['button', 'Inline', 'Flow', 'Common', [
                    'type' => 'Text',
                    'aria-label' => 'Text'
                ]],

                // http://developers.whatwg.org/text-level-semantics.html
                ['s',    'Inline', 'Inline', 'Common'],
                ['var',  'Inline', 'Inline', 'Common'],
                ['sub',  'Inline', 'Inline', 'Common'],
                ['sup',  'Inline', 'Inline', 'Common'],
                ['mark', 'Inline', 'Inline', 'Common'],
                ['wbr',  'Inline', 'Empty', 'Core'],

                // http://developers.whatwg.org/edits.html
                ['ins', 'Block', 'Flow', 'Common', ['cite' => 'URI', 'datetime' => 'CDATA']],
                ['del', 'Block', 'Flow', 'Common', ['cite' => 'URI', 'datetime' => 'CDATA']],
            ],
            'attributes' => [
                ['iframe', 'allowfullscreen', 'Bool'],
                ['table', 'height', 'Text'],
                ['td', 'border', 'Text'],
                ['th', 'border', 'Text'],
                ['tr', 'width', 'Text'],
                ['tr', 'height', 'Text'],
                ['tr', 'border', 'Text'],
            ],
        ],
        'custom_attributes' => [
            ['a', 'data-toggle', 'Text'],
            ['a', 'data-target', 'Text'],
        ],
    ],
];

Example html to clean:
<table><thead><tr><th>1</th><th>2</th><th>3</th><th>4</th></tr></thead><tbody><tr><td>5</td><td>6</td><td>7</td><td>8</td></tr></tbody></table>

Result:
<table>12345678</table>

I'm using version 3.3.6 with Laravel 6.20.36.