config.allowedContent = {
        sup: {
            attributes: ['*'],
            classes: ['*']
        },
        table: {
            attributes: ['*'],
            styles: ['*']
        },
        tr: {
            attributes: ['*'],
            styles: ['*']
        },
        th: {
            attributes: ['*'],
            classes: ['p-indent'],
            styles: ['*']
        },
        td: {
            attributes: ['*'],
            classes: ['p-indent'],
            styles: ['*']
        },
        tbody: {
            attributes: ['*'],
            styles: ['*']
        },
        thead: {
            attributes: ['*'],
            styles: ['*']
        },
        caption : {},
        img : {
            attributes: ['*'],
            classes: ['*'],
            styles: ['*']
        },
        code : {
            attributes: ['*'],
            classes: ['*'],
            styles: ['*']
        },
		pre : {
            attributes: ['*'],
            classes: ['*'],
            styles: ['*']
		},
        p : {
            styles: ['text-align', 'text-indent', 'border-bottom', 'border-top'],
            classes: ['*']
        },
        strong : {},
        i : {},
        s : {},
        u : {},
        ul : {},
        ol : {},
        li : {
            styles: ['text-align']
        },
        blockquote : {},
        span : {
            attributes: ['*'],
            classes: ['*'],
            styles: ['*']
        },
        a : {
            attributes: ['href', 'data-anchor-id', 'data-chapter-id', 'placeholder'],
            classes: ['link-to-anchor'],
        },
        iframe : {
            attributes: ['*'],
            classes: ['*'],
            styles: ['*']
        },
        div : {
            attributes: ['*'],
            classes: ['youtube-embed-wrapper'],
            styles: ['*']
        }
    };