diff --git a/.changeset/wild-bulldogs-move.md b/.changeset/wild-bulldogs-move.md
new file mode 100644
index 0000000000..c3c5580f77
--- /dev/null
+++ b/.changeset/wild-bulldogs-move.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: allow characters in the supplementary special-purpose plane
diff --git a/packages/svelte/src/compiler/phases/1-parse/utils/html.js b/packages/svelte/src/compiler/phases/1-parse/utils/html.js
index a68acb996f..a0c2a5b06f 100644
--- a/packages/svelte/src/compiler/phases/1-parse/utils/html.js
+++ b/packages/svelte/src/compiler/phases/1-parse/utils/html.js
@@ -72,6 +72,8 @@ const NUL = 0;
 // to replace them ourselves
 //
 // Source: http://en.wikipedia.org/wiki/Character_encodings_in_HTML#Illegal_characters
+// Also see: https://en.wikipedia.org/wiki/Plane_(Unicode)
+// Also see: https://html.spec.whatwg.org/multipage/parsing.html#preprocessing-the-input-stream
 
 /** @param {number} code */
 function validate_code(code) {
@@ -116,5 +118,10 @@ function validate_code(code) {
 		return code;
 	}
 
+	// supplementary special-purpose plane 0xe0000 - 0xe07f and 0xe0100 - 0xe01ef
+	if ((code >= 917504 && code <= 917631) || (code >= 917760 && code <= 917999)) {
+		return code;
+	}
+
 	return NUL;
 }