Anchor - <a> active, hover attributes missing

[gsalunke]

[amitu]

We will allow people to write:

-- ftd.text foo: some text
link: /
color if $LINK-ACTIVE: red
color if $VISITED: green

Etc. All style attributes can be conditional on these new variables. We will not allow non style attributes to use these variables, eg link if $VISITED: / is not allowed, it will be a compilation error.

For each component containing such attributes we will create a class. So eg for foo we will create:

.<doc-id>-foo:active {
     color: red;
}
.<doc-id>-foo:visited {
     color: green;
}

We will also allow them on elements:

-- ftd.text: 
link: /
color if $LINK-ACTIVE: red
color if $VISITED: green

For them we will auto create some ID and use that for CSS:

#<element-id>-foo:active {
     color: red;
}
#<element-id>-foo:visited {
     color: green;
}