fix: respect attrs on custom containers

src/node/markdown/plugins/containers.ts

@@ -41,15 +41,13 @@ function createContainer(
       render(tokens, idx) {
         const token = tokens[idx]
         const info = token.info.trim().slice(klass.length).trim()
+        const attrs = md.renderer.renderAttrs(token)
         if (token.nesting === 1) {
           const title = md.renderInline(info || defaultTitle)
-          if (klass === 'details') {
-            return `<details class="${klass} custom-block"><summary>${title}</summary>\n`
-          }
-          return `<div class="${klass} custom-block"><p class="custom-block-title">${title}</p>\n`
-        } else {
-          return klass === 'details' ? `</details>\n` : `</div>\n`
-        }
+          if (klass === 'details')
+            return `<details class="${klass} custom-block"${attrs}><summary>${title}</summary>\n`
+          return `<div class="${klass} custom-block"${attrs}><p class="custom-block-title">${title}</p>\n`
+        } else return klass === 'details' ? `</details>\n` : `</div>\n`
       }
     }
   ]