chore: fix syntax in demo site

Author: ota-meshi

docs-svelte-kit/src/lib/eslint/scripts/syntax.js

@@ -28,6 +28,7 @@ export const language = {
     ],
 
     svelteMustache: [
+      [/[\t\n\r ]+/], // whitespace
       [/(:)(else if)/, ["delimiter.svelte", "keyword.flow"]],
       [/([#/:@])([^\s}]+)/, ["delimiter.svelte", "keyword.flow"]],
       [/\}/, "delimiter", "@pop"],
@@ -79,7 +80,7 @@ export const language = {
     otherTag: [
       [/\/?>/, "delimiter", "@pop"],
       [
-        /([=])\s*(["'])/,
+        /([=])(["'])/,
         [
           "delimiter",
           {
@@ -88,6 +89,17 @@ export const language = {
           },
         ],
       ],
+      [
+        /([=])(\s+)(["'])/,
+        [
+          "delimiter",
+          "",
+          {
+            token: "attribute.value",
+            next: "@attributeValue.$3",
+          },
+        ],
+      ],
       [/[=]\s*\{/, "delimiter", "@svelteMustache"],
       [/"([^"]*)"/, "attribute.value"],
       [/'([^']*)'/, "attribute.value"],