diff --git a/packages/scramjet/packages/core/src/client/dom/css.ts b/packages/scramjet/packages/core/src/client/dom/css.ts
index 3429ab0f..0f693b7c 100644
--- a/packages/scramjet/packages/core/src/client/dom/css.ts
+++ b/packages/scramjet/packages/core/src/client/dom/css.ts
@@ -14,7 +14,7 @@ export default function (client: ScramjetClient) {
 		apply(ctx) {
 			const v = ctx.call();
 			if (!v) return v;
-			ctx.return(unrewriteCss(v));
+			ctx.return(unrewriteCss(v, client.context));
 		},
 	});
 
@@ -23,7 +23,7 @@ export default function (client: ScramjetClient) {
 			ctx.set(rewriteCss(value, client.context, client.meta));
 		},
 		get(ctx) {
-			return unrewriteCss(ctx.get());
+			return unrewriteCss(ctx.get(), client.context);
 		},
 	});
 
@@ -50,7 +50,7 @@ export default function (client: ScramjetClient) {
 			ctx.set(rewriteCss(value, client.context, client.meta));
 		},
 		get(ctx) {
-			return unrewriteCss(ctx.get());
+			return unrewriteCss(ctx.get(), client.context);
 		},
 	});
 
@@ -83,7 +83,7 @@ export default function (client: ScramjetClient) {
 					if (prop in CSSStyleDeclaration.prototype) return value;
 					if (!value) return value;
 
-					return unrewriteCss(value);
+					return unrewriteCss(value, client.context);
 				},
 				set(target, prop, value) {
 					if (prop == "cssText" || value == "" || typeof value !== "string") {
diff --git a/packages/scramjet/packages/core/src/client/dom/element.ts b/packages/scramjet/packages/core/src/client/dom/element.ts
index 15dccb0e..3974d210 100644
--- a/packages/scramjet/packages/core/src/client/dom/element.ts
+++ b/packages/scramjet/packages/core/src/client/dom/element.ts
@@ -442,7 +442,7 @@ export default function (client: ScramjetClient, self: typeof window) {
 				return ctx.get();
 			}
 			if (client.box.instanceof(ctx.this, "HTMLStyleElement")) {
-				return unrewriteCss(ctx.get() as string);
+				return unrewriteCss(ctx.get() as string, client.context);
 			}
 
 			return ctx.get();
@@ -565,7 +565,7 @@ export default function (client: ScramjetClient, self: typeof window) {
 	client.Trap("Text.prototype.wholeText", {
 		get(ctx) {
 			if (ctx.this.parentElement?.tagName === "STYLE") {
-				return unrewriteCss(ctx.get() as string);
+				return unrewriteCss(ctx.get() as string, client.context);
 			}
 
 			return ctx.get();
diff --git a/packages/scramjet/packages/core/src/shared/rewriters/css.ts b/packages/scramjet/packages/core/src/shared/rewriters/css.ts
index 54f52462..ddbaa37b 100644
--- a/packages/scramjet/packages/core/src/shared/rewriters/css.ts
+++ b/packages/scramjet/packages/core/src/shared/rewriters/css.ts
@@ -10,14 +10,14 @@ export function rewriteCss(
 	return handleCss("rewrite", css, context, meta);
 }
 
-export function unrewriteCss(css: string) {
-	return handleCss("unrewrite", css);
+export function unrewriteCss(css: string, context: ScramjetContext) {
+	return handleCss("unrewrite", css, context);
 }
 
 function handleCss(
 	type: "rewrite" | "unrewrite",
 	css: string,
-	context?: ScramjetContext,
+	context: ScramjetContext,
 	meta?: URLMeta
 ) {
 	// regex from vk6 (https://github.com/ading2210)
@@ -25,26 +25,26 @@ function handleCss(
 	const Atruleregex =
 		/@import\s+((?i:url)\s*?\(.{0,9999}?\)|['"].{0,9999}?['"]|.{0,9999}?)($|\s|;)/gm;
 	css = String(css);
-	css = css.replace(urlRegex, (match, url) => {
+	css = css.replace(urlRegex, (match, url: string) => {
 		const encodedUrl =
 			type === "rewrite"
-				? rewriteUrl(url.trim(), context, meta)
+				? rewriteUrl(url.trim(), context, meta!)
 				: unrewriteUrl(url.trim(), context);
 
 		return match.replace(url, encodedUrl);
 	});
-	css = css.replace(Atruleregex, (match, importStatement) => {
+	css = css.replace(Atruleregex, (match, importStatement: string) => {
 		return match.replace(
 			importStatement,
 			importStatement.replace(
 				/^(url\(['"]?|['"]|)(.+?)(['"]|['"]?\)|)$/gm,
-				(match, firstQuote, url, endQuote) => {
+				(match: string, firstQuote: string, url: string, endQuote: string) => {
 					if (firstQuote.startsWith("url")) {
 						return match;
 					}
 					const encodedUrl =
 						type === "rewrite"
-							? rewriteUrl(url.trim(), context, meta)
+							? rewriteUrl(url.trim(), context, meta!)
 							: unrewriteUrl(url.trim(), context);
 
 					return `${firstQuote}${encodedUrl}${endQuote}`;
diff --git a/packages/scramjet/packages/runway/src/tests/rewriter-css.ts b/packages/scramjet/packages/runway/src/tests/rewriter-css.ts
index 1fd0ecf8..5b93f5f6 100644
--- a/packages/scramjet/packages/runway/src/tests/rewriter-css.ts
+++ b/packages/scramjet/packages/runway/src/tests/rewriter-css.ts
@@ -1,4 +1,8 @@
-import { rewriteCss, rewriteUrl } from "@mercuryworkshop/scramjet";
+import {
+	rewriteCss,
+	rewriteUrl,
+	unrewriteCss,
+} from "@mercuryworkshop/scramjet";
 import { directTest, type Test } from "../testcommon.ts";
 
 function createRewriteContext() {
@@ -68,6 +72,28 @@ function cssRewriteMultiTest(props: {
 	});
 }
 
+function cssUnrewriteTest(props: {
+	name: string;
+	url: string;
+	fn: (url: string, encoded: string) => [string, string];
+}) {
+	const { name, url, fn } = props;
+	return directTest({
+		name,
+		fn: ({ assertEqual }) => {
+			const { context, meta } = createRewriteContext();
+			const encoded = rewriteUrl(url, context, meta);
+			const [input, expected] = fn(url, encoded);
+			const unrewritten = unrewriteCss(input, context);
+			assertEqual(
+				unrewritten,
+				expected,
+				`${name}: ${input} should be unrewritten to ${expected}`
+			);
+		},
+	});
+}
+
 export default [
 	cssRewriteTest({
 		name: "rewriter-css-url",
@@ -277,4 +303,43 @@ export default [
 			assertEqual(rewriteCss(input, context, meta), input);
 		},
 	}),
+	cssUnrewriteTest({
+		name: "rewriter-css-unrewrite-url",
+		url: "/assets/bg.png",
+		fn: (url, encoded) => [
+			`body{background:url("${encoded}")}`,
+			`body{background:url("${url}")}`,
+		],
+	}),
+	cssUnrewriteTest({
+		name: "rewriter-css-unrewrite-import-string",
+		url: "/styles/theme.css",
+		fn: (url, encoded) => [`@import "${encoded}";`, `@import "${url}";`],
+	}),
+	cssUnrewriteTest({
+		name: "rewriter-css-unrewrite-import-url",
+		url: "/styles/theme.css",
+		fn: (url, encoded) => [
+			`@import url("${encoded}");`,
+			`@import url("${url}");`,
+		],
+	}),
+	cssUnrewriteTest({
+		name: "rewriter-css-unrewrite-uppercase-url-function",
+		url: "/z.png",
+		fn: (url, encoded) => [
+			`b{background:URL("${encoded}")}`,
+			`b{background:URL("${url}")}`,
+		],
+	}),
+	directTest({
+		name: "rewriter-css-unrewrite-regression-import-layer-supports-media",
+		fn: ({ assertEqual }) => {
+			const { context, meta } = createRewriteContext();
+			const input =
+				'@import url("/bundle.css") layer(theme) supports(display: grid) screen, print;';
+			const rewritten = rewriteCss(input, context, meta);
+			assertEqual(unrewriteCss(rewritten, context), input);
+		},
+	}),
 ];