expand list of interesttarget elements

Fixes #10

README.md

@@ -10,11 +10,12 @@ ship for interactivity. Buttons with `invokertarget` will - when clicked,
 touched, or enacted via keypress - dispatch an `InvokeEvent` on the element
 referenced by `invokertarget`, with some default behaviours.
 
-In addition, adding an `interesttarget` attribute to `<button>`, `<a>`,
-`<area>`, `<input>` elements would allow disclosure of high fidelity tooltips in a more
-accessible and declaritive way. Elements with `interesttarget` will - when
-hovered, long pressed, or focussed - dispatch an `InterestEvent` on the element
-referenced by `interesttarget`, with some default behaviours.
+In addition, this proposals seeks to add an `interesttarget` attribute to
+interactive elements: `<button>`, `<a>`, `<area>`, `<input>`, `<textarea>`,
+`<select>`, `<summary>`. This would allow disclosure of high fidelity tooltips
+in a more accessible and declarative way. Elements with `interesttarget` will -
+when hovered, long pressed, or focussed - dispatch an `InterestEvent` on the
+element referenced by `interesttarget`, with some default behaviours.
 
 ## Background
 
@@ -74,8 +75,8 @@ the balance.
   such as eye tracking or game controllers, the equivalent "focusout or
   mouseout" action is used to _Lose Interest_ on the element.
 - Invoker: An invoker is a button element (that is a `<button>`,
-  `<input type="button">`, or `<input type="reset">`) that has an `invokertarget`
-  attribute set.
+  `<input type="button">`, or `<input type="reset">`) that has an
+  `invokertarget` attribute set.
 - Invokee: An element which is referenced to by an Invoker, via the
   `invokertarget` attribute.
 - Interestee: An element which is referenced to by an Interest element, via the
@@ -86,7 +87,8 @@ the balance.
 In the style of `popovertarget`, this document proposes we add `invokertarget`,
 and `invokeraction` as available attributes to `<button>`,
 `<input type="button">` and `<input type="reset">` elements, as well as an
-`interesttarget` attribute to `<button>`, `<a>`, `<area>` and `<input>` elements.
+`interesttarget` attribute to `<button>`, `<a>`, `<area>` and `<input>`
+elements.
 
 ```webidl
 interface mixin InvokerElement {
@@ -96,14 +98,19 @@ interface mixin InvokerElement {
 interface mixing InterestElement {
   [CEReactions] attribute Element? interestTargetElement;
 }
+
+HTMLButtonElement extends InvokerElement
+HTMLInputElement extends InvokerElement
+
+HTMLElement extends InterestElement
 ```
 
 The `invokertarget` value should be an IDREF pointing to an element within the
 document. `.invokerTargetElement` also exists on the element to imperatively
 assign a node to be the invoker target, allowing for cross-root invokers (in
 some cases, see
-[the popovertarget attr-asociated element steps](https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#attr-associated-element) for
-more).
+[the popovertarget attr-asociated element steps](https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#attr-associated-element)
+for more).
 
 The `invokeraction` (and the `.invokerAction` reflected property) is a freeform
 hint to the Invokee. If `invokeraction` is a falsey value (`''`, `null`, etc.)
@@ -118,8 +125,8 @@ The `interesttarget` value should be an IDREF pointing to an element within the
 document. `.interestTargetElement` also exists on the element to imperatively
 assign a node to be the invoker target, allowing for cross-root invokers (in
 some cases, see
-[the popovertarget attr-asociated element steps](https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#attr-associated-element) for
-more).
+[the popovertarget attr-asociated element steps](https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#attr-associated-element)
+for more).
 
 Elements with `invokertarget` set will dispatch an `InvokeEvent` on the
 _Invokee_ (the element referenced by `invokertarget`) when the element is