Allow HTML elements details and summary

[Steve-Mcl]

Hi,

would you consider permitting details and summary
Ref: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/details

Here is a working example...

Code changes are quite simple...

openKB.js...

       var cleanHTML = sanitizeHtml(fixed_html, {
            allowedTags: [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'blockquote', 'p', 'a', 'ul', 'ol',
                'nl', 'li', 'b', 'i', 'strong', 'em', 'strike', 'code', 'hr', 'br', 'div',
                'table', 'thead', 'caption', 'tbody', 'tr', 'th', 'td', 'pre', 'img', 'iframe',
                'details','summary'  /* << Add details and summary */
            ],
            allowedAttributes: false
        });

common.js...

    return sanitizeHtml(html, {
        allowedTags: [ 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'blockquote', 'p', 'a', 'ul', 'ol',
            'nl', 'li', 'b', 'i', 'strong', 'em', 'strike', 'code', 'hr', 'br', 'div',
            'table', 'thead', 'caption', 'tbody', 'tr', 'th', 'td', 'pre', 'img', 'iframe',
            'details','summary' /* << Add details and summary */
        ],
        allowedAttributes: false  
    });