fixed iframe attribute allow behavior

Author: RandomHashTags

Sources/HTMLKit/HTMLKit.swift

@@ -455,7 +455,7 @@ public macro i<T: ExpressibleByStringLiteral>(
 public macro iframe<T: ExpressibleByStringLiteral>(
     attributes: [HTMLElementAttribute] = [],
 
-    allow: T? = nil,
+    allow: [T] = [],
     browsingtopics: Bool = false,
     credentialless: Bool = false,
     csp: T? = nil,

Sources/HTMLKitMacros/HTMLElement.swift

@@ -349,6 +349,9 @@ private extension HTMLElement {
                 case "accept", "coords", "exportparts", "imagesizes", "imagesrcset", "sizes", "srcset":
                     separator = ","
                     break
+                case "allow":
+                    separator = ";"
+                    break
                 default:
                     separator = " "
                     break

Tests/HTMLKitTests/ElementTests.swift

@@ -209,9 +209,13 @@ extension ElementTests {
     }
 
     // MARK: iframe
+    // https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe
     @Test func iframe() {
-        let string:StaticString = #iframe(sandbox: [.allowDownloads, .allowForms])
+        var string:StaticString = #iframe(sandbox: [.allowDownloads, .allowForms])
         #expect(string == "<iframe sandbox=\"allow-downloads allow-forms\"></iframe>")
+
+        string = #iframe(allow: ["geolocation", "test"])
+        #expect(string == "<iframe allow=\"geolocation;test\"></iframe>")
     }
 
     // MARK: input