diff --git a/src/client/dom/element.ts b/src/client/dom/element.ts
index 508a1eb..48c79a2 100644
--- a/src/client/dom/element.ts
+++ b/src/client/dom/element.ts
@@ -123,7 +123,7 @@ export default function (client: ScramjetClient, self: typeof window) {
 			const [name, value] = ctx.args;
 
 			const ruleList = htmlRules.find((rule) => {
-				const r = rule[name];
+				const r = rule[name.toLowerCase()];
 				if (!r) return false;
 				if (r === "*") return true;
 				if (typeof r === "function") return false; // this can't happen but ts
@@ -142,7 +142,7 @@ export default function (client: ScramjetClient, self: typeof window) {
 			const [namespace, name, value] = ctx.args;
 
 			const ruleList = htmlRules.find((rule) => {
-				const r = rule[name];
+				const r = rule[name.toLowerCase()];
 				if (!r) return false;
 				if (r === "*") return true;
 				if (typeof r === "function") return false; // this can't happen but ts
diff --git a/src/shared/rewriters/html.ts b/src/shared/rewriters/html.ts
index 79eacf2..735bef2 100644
--- a/src/shared/rewriters/html.ts
+++ b/src/shared/rewriters/html.ts
@@ -155,7 +155,6 @@ export const htmlRules: {
 
 		// srcset
 		srcset: ["img", "source"],
-		srcSet: ["img", "source"],
 		imagesrcset: ["link"],
 	},
 	{
@@ -200,7 +199,7 @@ function traverseParsedHtml(
 	if (node.attribs) {
 		for (const rule of htmlRules) {
 			for (const attr in rule) {
-				const sel = rule[attr];
+				const sel = rule[attr.toLowerCase()];
 				if (typeof sel === "function") continue;
 
 				if (sel === "*" || sel.includes(node.name)) {