Add missing features

Author: captainbrosset

microsoft-edge/web-platform/release-notes/134.md

@@ -72,6 +72,14 @@ There are some caveats due to properties not allowed on a highlight pseudo and h
 Enables a page to limit the maximum brightness of HDR content.
 
 
+<!-- ---------- -->
+###### Customizable `<select>` Element
+
+Customizable `<select>` allows developers to take complete control of the rendering of `<select>` elements by adding the `appearance:base-select` CSS declaration.
+
+This feature relies on the `SelectParserRelaxation` flag, which changes the HTML parser to allow more tags within the `<select>` tag. Sites which include additional tags inside `<select>` which were getting removed before, such as `<span>`s, or are including an extremely large number of `<option>`s may be affected by `SelectParserRelaxation`.
+
+
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 ###### Dialog light dismiss
 
@@ -82,6 +90,12 @@ This brings the "light dismiss" behavior of the Popover API to `<dialog>` elemen
 * `<dialog closedby=any>` - user clicking outside the dialog, or pressing ESC, closes the dialog. Akin to `popover=auto` behavior.
 
 
+<!-- ---------- -->
+###### `application-title` meta tag for installed web apps
+
+This feature allows developers of installed web applications to set the text they want to display in the title bar of the window by using the `<meta name="application-title">` tag in the HTML head. This replaces the text contained in the HTML `<title>` tag when the application is installed.
+
+
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 ###### Document-Policy: expect-no-linked-resources