feat: add CSS @view-transition (#4313)

MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/@view-transition

Author: yisibl

CHANGELOG.md

@@ -1,5 +1,19 @@
 # Changelog
 
+* Add support for the new `@view-transition` CSS at rule ([#4313](https://github.com/evanw/esbuild/pull/4313))
+
+    ```css
+    /* Original code */
+    @view-transition {
+      navigation: auto;
+      types: check;
+    }
+    /* Output */
+    @view-transition{navigation:auto;types:check}
+    ```
+
+    This was contributed by [@yisibl](https://github.com/yisibl).
+
 ## 0.25.11
 
 * Add support for `with { type: 'bytes' }` imports ([#4292](https://github.com/evanw/esbuild/issues/4292))

internal/css_parser/css_parser.go

@@ -1109,6 +1109,10 @@ var specialAtRules = map[string]atRuleKind{
 	// Anchor Positioning
 	// Reference: https://drafts.csswg.org/css-anchor-position-1/#at-ruledef-position-try
 	"position-try": atRuleDeclarations,
+
+	// @view-transition
+	// Reference: https://drafts.csswg.org/css-view-transitions-2/#view-transition-rule
+	"view-transition": atRuleDeclarations,
 }
 
 var atKnownRuleCanBeRemovedIfEmpty = map[string]bool{

internal/css_parser/css_parser_test.go

@@ -1516,6 +1516,10 @@ func TestAtRule(t *testing.T) {
 		}
 	}
 }`, "@supports (container-type: size){@container (width <= 150px){#inner{background-color:#87ceeb}}}", "")
+	expectPrintedMinify(t, `@view-transition {
+  navigation: auto;
+	types: check;
+}`, "@view-transition{navigation:auto;types:check}", "")
 
 	// https://drafts.csswg.org/css-transitions-2/#defining-before-change-style-the-starting-style-rule
 	expectPrinted(t, `