Can be used to preprocess the given +html+ String before it is scrubbed.

Scrubs its argument. Possible arguments are the following.

• A single tag given its attributes and children: {tag, attributes, children}. In this case calls scrub_attribute/2 to scrub individual attributes.
• Tokens like comments and doctypes: {_token, children}.
• A text node.

Scrubs a single attribute for a given tag.

You can utilize scrub_attribute to write custom matchers so you can sanitize specific attributes of specific tags:

As an example, if you only want to allow href attribute with the "http" and "https" protocols, you could implement it like this:

def scrub_attribute("a", {"href", "http" <> target}) do
  {"href", "http" <> target}
end

def scrub_attribute("a", {"href", _}) do
  nil
end