HTML.Allowed TYPE: itext/null VERSION: 2.0.0 DEFAULT: NULL --DESCRIPTION--
    This is a preferred convenience directive that combines
    %HTML.AllowedElements and %HTML.AllowedAttributes.
    Specify elements and attributes that are allowed using:
    element1[attr1|attr2],element2....  For example,
    if you would like to only allow paragraphs and links, specify
    a[href],p.  You can specify attributes that apply
    to all elements using an asterisk, e.g. *[lang].
    You can also use newlines instead of commas to separate elements.
    Warning:
    All of the constraints on the component directives are still enforced.
    The syntax is a subset of TinyMCE's valid_elements
    whitelist: directly copy-pasting it here will probably result in
    broken whitelists. If %HTML.AllowedElements or %HTML.AllowedAttributes
    are set, this directive has no effect.