diff --git a/package.json b/package.json
index 6b80eb2f..234e5034 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
   "devDependencies": {
     "@changesets/cli": "^2.27.10",
     "@types/node": "^22.10.1",
-    "happy-dom": "^15.11.7",
+    "happy-dom": "^16.0.0",
     "prettier": "^3.4.2",
     "prettier-plugin-astro": "^0.14.1",
     "prettier-plugin-tailwindcss": "^0.6.9",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index adb5a509..51a9bc17 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -18,8 +18,8 @@ importers:
         specifier: ^22.10.1
         version: 22.10.7
       happy-dom:
-        specifier: ^15.11.7
-        version: 15.11.7
+        specifier: ^16.0.0
+        version: 16.7.2
       prettier:
         specifier: ^3.4.2
         version: 3.4.2
@@ -40,7 +40,7 @@ importers:
         version: 5.1.4(typescript@5.7.3)(vite@5.4.11(@types/node@22.10.7))
       vitest:
         specifier: ^2.1.8
-        version: 2.1.8(@types/node@22.10.7)(happy-dom@15.11.7)(jsdom@25.0.1)
+        version: 2.1.8(@types/node@22.10.7)(happy-dom@16.7.2)(jsdom@25.0.1)
 
   examples/javascript:
     dependencies:
@@ -64,7 +64,7 @@ importers:
         version: link:../../packages/cli
       svelte:
         specifier: ^4.2.19
-        version: 5.19.2
+        version: 4.2.19
 
   examples/typescript:
     dependencies:
@@ -2804,6 +2804,9 @@ packages:
   code-block-writer@13.0.3:
     resolution: {integrity: sha512-Oofo0pq3IKnsFtuHqSF7TqBfr71aeyZDVJ0HpmqB7FBM2qEigL0iPONSCZSO9pE9dZTAxANe5XHG9Uy0YMv8cg==}
 
+  code-red@1.0.4:
+    resolution: {integrity: sha512-7qJWqItLA8/VPVlKJlFXU+NBlo/qyfs39aJcuMT/2ere32ZqvF5OSxgdM5xOfJJ7O429gg2HM47y8v9P+9wrNw==}
+
   collapse-white-space@2.1.0:
     resolution: {integrity: sha512-loKTxY1zCOuG4j9f6EPnuyyYkf58RnhhWTvRoZEokgB+WbdXehfjFviyOVYkqzEWz1Q5kRiZdBYS5SwxbQYwzw==}
 
@@ -2887,6 +2890,10 @@ packages:
   css-selector-parser@3.0.5:
     resolution: {integrity: sha512-3itoDFbKUNx1eKmVpYMFyqKX04Ww9osZ+dLgrk6GEv6KMVeXUhUnp4I5X+evw+u3ZxVU6RFXSSRxlTeMh8bA+g==}
 
+  css-tree@2.3.1:
+    resolution: {integrity: sha512-6Fv1DV/TYw//QF5IzQdqsNDjx/wc8TrMBZsqjL9eW01tWb7R7k/mq+/VXfJCl7SoD5emsJop9cOByJZfs8hYIw==}
+    engines: {node: ^10 || ^12.20.0 || ^14.13.0 || >=15.0.0}
+
   cssesc@3.0.0:
     resolution: {integrity: sha512-/Tb/JcjK111nNScGob5MNtsntNM1aCNUDipB/TkwZFhyDrrE47SOx/18wF2bbjgc3ZzCSKW1T5nt5EbFoAz/Vg==}
     engines: {node: '>=4'}
@@ -3321,8 +3328,8 @@ packages:
   h3@1.13.1:
     resolution: {integrity: sha512-u/z6Z4YY+ANZ05cRRfsFJadTBrNA6e3jxdU+AN5UCbZSZEUwgHiwjvUEe0k1NoQmAvQmETwr+xB5jd7mhCJuIQ==}
 
-  happy-dom@15.11.7:
-    resolution: {integrity: sha512-KyrFvnl+J9US63TEzwoiJOQzZBJY7KgBushJA8X61DMbNsH+2ONkDuLDnCnwUiPTF42tLoEmrPyoqbenVA5zrg==}
+  happy-dom@16.7.2:
+    resolution: {integrity: sha512-zOzw0xyYlDaF/ylwbAsduYZZVRTd5u7IwlFkGbEathIeJMLp3vrN3cHm3RS7PZpD9gr/IO16bHEswcgNyWTsqw==}
     engines: {node: '>=18.0.0'}
 
   has-flag@4.0.0:
@@ -3782,6 +3789,9 @@ packages:
   mdast-util-to-string@4.0.0:
     resolution: {integrity: sha512-0H44vDimn51F0YwvxSJSm0eCDOJTRlmN0R1yBh4HLj9wiV1Dn0QoXGbvFAWj2hSItVTlCmBF1hqKlIyUBVFLPg==}
 
+  mdn-data@2.0.30:
+    resolution: {integrity: sha512-GaqWWShW4kv/G9IEucWScBx9G1/vsFZZJUO+tD26M8J8z3Kw5RDQjaoZe03YAClgeS/SWPOcb4nkFBTEi5DUEA==}
+
   merge-stream@2.0.0:
     resolution: {integrity: sha512-abv/qOcuPfk3URPfDzmZU1LKmuw8kT+0nIHvKrKgFrwifol/doWcdA4ZqsWQ8ENrFKkd67Mfpo/LovbIUsbt3w==}
 
@@ -4176,6 +4186,9 @@ packages:
     resolution: {integrity: sha512-vE7JKRyES09KiunauX7nd2Q9/L7lhok4smP9RZTDeD4MVs72Dp2qNFVz39Nz5a0FVEW0BJR6C0DYrq6unoziZA==}
     engines: {node: '>= 14.16'}
 
+  periscopic@3.1.0:
+    resolution: {integrity: sha512-vKiQ8RRtkl9P+r/+oefh25C3fhybptkHKCZSPlcXiJux2tJF55GnEj3BVn4A5gKfq9NWWXXrxkHBwVPUfH0opw==}
+
   picocolors@1.1.1:
     resolution: {integrity: sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==}
 
@@ -4774,6 +4787,10 @@ packages:
     resolution: {integrity: sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==}
     engines: {node: '>= 0.4'}
 
+  svelte@4.2.19:
+    resolution: {integrity: sha512-IY1rnGr6izd10B0A8LqsBfmlT5OILVuZ7XsI0vdGPEvuonFV7NYEUK4dAkm9Zg2q0Um92kYjTpS1CAP3Nh/KWw==}
+    engines: {node: '>=16'}
+
   svelte@5.19.2:
     resolution: {integrity: sha512-Ww1uLgdX5MdQrAO5zfU1dWUh6zqiPR6uIbwqm8a+4eQ+tNEYHRPgypvKKfHh9lmTkmJ30PWZ2O5qX8aS+PblRQ==}
     engines: {node: '>=18'}
@@ -7541,7 +7558,7 @@ snapshots:
     dependencies:
       '@vitest/spy': 2.1.8
       estree-walker: 3.0.3
-      magic-string: 0.30.14
+      magic-string: 0.30.17
     optionalDependencies:
       vite: 5.4.11(@types/node@22.10.7)
 
@@ -7557,7 +7574,7 @@ snapshots:
   '@vitest/snapshot@2.1.8':
     dependencies:
       '@vitest/pretty-format': 2.1.8
-      magic-string: 0.30.14
+      magic-string: 0.30.17
       pathe: 1.1.2
 
   '@vitest/spy@2.1.8':
@@ -8012,6 +8029,14 @@ snapshots:
 
   code-block-writer@13.0.3: {}
 
+  code-red@1.0.4:
+    dependencies:
+      '@jridgewell/sourcemap-codec': 1.5.0
+      '@types/estree': 1.0.6
+      acorn: 8.14.0
+      estree-walker: 3.0.3
+      periscopic: 3.1.0
+
   collapse-white-space@2.1.0: {}
 
   color-convert@2.0.1:
@@ -8083,6 +8108,11 @@ snapshots:
 
   css-selector-parser@3.0.5: {}
 
+  css-tree@2.3.1:
+    dependencies:
+      mdn-data: 2.0.30
+      source-map-js: 1.2.1
+
   cssesc@3.0.0: {}
 
   cssstyle@4.1.0:
@@ -8591,9 +8621,8 @@ snapshots:
       uncrypto: 0.1.3
       unenv: 1.10.0
 
-  happy-dom@15.11.7:
+  happy-dom@16.7.2:
     dependencies:
-      entities: 4.5.0
       webidl-conversions: 7.0.0
       whatwg-mimetype: 3.0.0
 
@@ -9275,6 +9304,8 @@ snapshots:
     dependencies:
       '@types/mdast': 4.0.4
 
+  mdn-data@2.0.30: {}
+
   merge-stream@2.0.0: {}
 
   merge2@1.4.1: {}
@@ -9810,6 +9841,12 @@ snapshots:
 
   pathval@2.0.0: {}
 
+  periscopic@3.1.0:
+    dependencies:
+      '@types/estree': 1.0.6
+      estree-walker: 3.0.3
+      is-reference: 3.0.3
+
   picocolors@1.1.1: {}
 
   picomatch@2.3.1: {}
@@ -10465,6 +10502,23 @@ snapshots:
 
   supports-preserve-symlinks-flag@1.0.0: {}
 
+  svelte@4.2.19:
+    dependencies:
+      '@ampproject/remapping': 2.3.0
+      '@jridgewell/sourcemap-codec': 1.5.0
+      '@jridgewell/trace-mapping': 0.3.25
+      '@types/estree': 1.0.6
+      acorn: 8.14.0
+      aria-query: 5.3.2
+      axobject-query: 4.1.0
+      code-red: 1.0.4
+      css-tree: 2.3.1
+      estree-walker: 3.0.3
+      is-reference: 3.0.3
+      locate-character: 3.0.0
+      magic-string: 0.30.17
+      periscopic: 3.1.0
+
   svelte@5.19.2:
     dependencies:
       '@ampproject/remapping': 2.3.0
@@ -10916,7 +10970,7 @@ snapshots:
     optionalDependencies:
       vite: 6.0.11(@types/node@22.10.7)(jiti@1.21.7)(tsx@4.19.2)(yaml@2.7.0)
 
-  vitest@2.1.8(@types/node@22.10.7)(happy-dom@15.11.7)(jsdom@25.0.1):
+  vitest@2.1.8(@types/node@22.10.7)(happy-dom@16.7.2)(jsdom@25.0.1):
     dependencies:
       '@vitest/expect': 2.1.8
       '@vitest/mocker': 2.1.8(vite@5.4.11(@types/node@22.10.7))
@@ -10940,7 +10994,7 @@ snapshots:
       why-is-node-running: 2.3.0
     optionalDependencies:
       '@types/node': 22.10.7
-      happy-dom: 15.11.7
+      happy-dom: 16.7.2
       jsdom: 25.0.1
     transitivePeerDependencies:
       - less