Define the existing 2021 and 2022 focus area scopes

focus_areas.md

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+# Focus Areas
+
+Concise definitions of what is in scope for each focus area:
+
+*  interop-2022-cascade: 
+    * Cascade Layers, CSS Cascade Level 5
+*  interop-2022-color: 
+    * CSS `<color>` type, CSS Color Level 4
+*  interop-2022-contain: 
+    * CSS contain property, CSS Containment Level 1, excluding the `style` keyword value
+*  interop-2022-dialog: 
+    * the dialog element and its open attribute,
+    * the IDL at https://html.spec.whatwg.org/review-drafts/2021-07/#the-dialog-element,
+    *  any integration into other web platform features (e.g., CSS Animations)
+*  interop-2022-forms:
+    * [not sure this can be concise, yikes]
+*  interop-2022-scrolling:
+    * CSS Overscroll Behavior Module Level 1;
+    * CSS Scroll Snap Module Level 1;
+    * dictionary ScrollOptions and its usage, CSSOM View Level 1
+*  interop-2022-subgrid:
+    * `subgrid` value for grid-template-columns and grid-template-rows, CSS Grid Level 2
+*  interop-2022-text:
+    * [again not concise]
+*  interop-2022-viewport:
+    * Viewport-percentage Lengths, CSS Values and Units Level 4
+*  interop-2022-webcompat:
+    * [do we want to enumerate specific tests, or the areas under test?]
+*  interop-2021-aspect-ratio:
+    * CSS aspect-ratio property, CSS Box Sizing Module Level 4
+    * https://html.spec.whatwg.org/multipage/rendering.html#dimRendering
+*  interop-2021-flexbox:
+    * CSS Flexible Box Module Level 1
+*  interop-2021-grid:
+    * CSS Grid Layout Level 1
+*  interop-2021-position-sticky:
+    * CSS position property, sticky value, CSS Positioned Layout Module Level 3
+*  interop-2021-transforms:
+    * CSS Transforms Module Level 1 [maybe, not sure, maybe it's a smaller subset?]
+