Map even more tests to web-features (web-platform-tests#43390)

The list of tests for nesting are from here:
web-platform-tests/interop#420 (comment)

background-fetch/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: background-fetch
+  files: "**"

css/css-anchor-position/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: anchor-positioning
+  files: "**"

css/css-contain/container-queries/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: container-queries
+  files: "**"

css/css-contain/content-visibility/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: content-visibility
+  files: "**"

css/css-grid/animation/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: grid-animation
+  files: "**"

css/css-images/image-set/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: image-set
+  files: "**"

css/css-inline/text-box-trim/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: text-box-trim
+  files: "**"

css/css-nesting/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: nesting
+  files: "**"

css/css-syntax/WEB_FEATURES.yml

@@ -0,0 +1,6 @@
+features:
+- name: nesting
+  files:
+  - custom-property-rule-ambiguity.html
+  - trailing-braces.html
+  - var-with-blocks.html

css/css-text/text-indent/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: text-indent
+  files: "**"

css/css-variables/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: custom-properties
+  files: "**"

css/css-view-transitions/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: view-transitions
+  files: "**"

custom-elements/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: custom-elements
+  files: "**"

document-picture-in-picture/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: document-picture-in-picture
+  files: "**"

html/canvas/offscreen/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: offscreen-canvas
+  files: "**"

html/semantics/interactive-elements/the-dialog-element/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: dialog
+  files: "**"

picture-in-picture/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: picture-in-picture
+  files: "**"

sanitizer-api/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: sanitizer
+  files: "**"

shadow-dom/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: shadow-dom
+  files: "**"

web-animations/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: web-animations
+  files: "**"

webhid/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: webhid
+  files: "**"

webmessaging/broadcastchannel/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: broadcast-channel
+  files: "**"

webtransport/WEB_FEATURES.yml

@@ -0,0 +1,3 @@
+features:
+- name: webtransport
+  files: "**"