itemscope function
itemscope
(usually) works along with [itemtype](https://developer.mozilla.org/docs/Web/HTML/Global_attributes#attr-itemtype)
to specify that the HTML contained in a block is about a particular item. itemscope
creates the Item and defines the scope of the itemtype
associated with it. itemtype
is a valid URL of a vocabulary (such as schema.org) that describes the item and its properties context.
Implementation
Attribute<GlobalHTMLAttribute> itemscope(String value) {
return Attribute('itemscope', value);
}