diff --git a/$index.ts b/$index.ts
index b9091c0..d71e95d 100644
--- a/$index.ts
+++ b/$index.ts
@@ -116,19 +116,27 @@ export namespace $ {
     : H extends HTMLTextAreaElement ? $Textarea
     : $Container<H>;
 
+    /**
+     * A helper for fluent method design. Return the `instance` object when arguments length not equal 0. Otherwise, return the `value`.
+     * @param instance The object to return when arguments length not equal 0.
+     * @param args The method `arguments`.
+     * @param value The value to return when arguments length equal 0.
+     * @param action The action to execute when arguments length not equal 0.
+     * @returns 
+     */
     export function fluent<T, A, V>(instance: T, args: IArguments, value: () => V, action: (...args: any[]) => void) {
         if (!args.length) return value();
         action();
         return instance;
     }
     
-    export function multableResolve<T>(multable: OrArray<T>) {
+    export function orArrayResolve<T>(multable: OrArray<T>) {
         if (multable instanceof Array) return multable;
         else return [multable];
     }
     
     export function mixin(target: any, constructors: OrArray<any>) {
-        multableResolve(constructors).forEach(constructor => {
+        orArrayResolve(constructors).forEach(constructor => {
             Object.getOwnPropertyNames(constructor.prototype).forEach(name => {
             if (name === 'constructor') return;
             Object.defineProperty(
@@ -140,15 +148,24 @@ export namespace $ {
         })
         return target;
     }
-    
-    export function set<O, K extends keyof O>(object: O, key: K, value: any, methodKey?: string) {
+    /**
+     * A helper for $State.set() which apply value to target.
+     * @param object Target object.
+     * @param key The key of target object.
+     * @param value Value of target property or parameter of method(Using Tuple to apply parameter).
+     * @param methodKey Variant key name when apply value on $State.set()
+     * @returns 
+     */
+    export function set<O, K extends keyof O>(object: O, key: K, value: O[K] extends (...args: any) => any ? (Parameters<O[K]> | $State<Parameters<O[K]>>) : O[K] | undefined | $State<O[K]>, methodKey?: string) {
         if (value === undefined) return;
         if (value instanceof $State && object instanceof Node) {
             value.use(object.$, methodKey ?? key as any);
-            object[key] = value.value;
+            const prop = object[key];
+            if (prop instanceof Function) prop(value.value);
+            else object[key] = value.value;
             return;
         }
-        object[key] = value;
+        object[key] = value as any;
     }
     
     export function state<T>(value: T) {
diff --git a/lib/$Button.ts b/lib/$Button.ts
index 06de082..d575d6f 100644
--- a/lib/$Button.ts
+++ b/lib/$Button.ts
@@ -1,10 +1,6 @@
 import { $Container, $ContainerOptions } from "./$Container";
-import { FormElementMethod, $FormElementMethod } from "./$Form";
 import { $State } from "./$State";
 export interface $ButtonOptions extends $ContainerOptions {}
-//@ts-expect-error
-export interface $Button extends $FormElementMethod {}
-@FormElementMethod
 export class $Button extends $Container<HTMLButtonElement> {
     constructor(options?: $ButtonOptions) {
         super('button', options);
@@ -16,8 +12,28 @@ export class $Button extends $Container<HTMLButtonElement> {
     
     type(): ButtonType;
     type(type: ButtonType): this;
-    type(type?: ButtonType) { return $.fluent(this, arguments, () => this.dom.type as ButtonType, () => $.set(this.dom, 'type', type))}
+    type(type?: ButtonType) { return $.fluent(this, arguments, () => this.dom.type as ButtonType, () => $.set(this.dom, 'type', type as any))}
     
     checkValidity() { return this.dom.checkValidity() }
     reportValidity() { return this.dom.reportValidity() }
+
+    formAction(): string;
+    formAction(action: string | undefined): this;
+    formAction(action?: string) { return $.fluent(this, arguments, () => this.dom.formAction, () => $.set(this.dom, 'formAction', action))}
+
+    formEnctype(): string;
+    formEnctype(enctype: string | undefined): this;
+    formEnctype(enctype?: string) { return $.fluent(this, arguments, () => this.dom.formEnctype, () => $.set(this.dom, 'formEnctype', enctype))}
+    
+    formMethod(): string;
+    formMethod(method: string | undefined): this;
+    formMethod(method?: string) { return $.fluent(this, arguments, () => this.dom.formMethod, () => $.set(this.dom, 'formMethod', method))}
+
+    formNoValidate(): boolean;
+    formNoValidate(boolean: boolean | undefined): this;
+    formNoValidate(boolean?: boolean) { return $.fluent(this, arguments, () => this.dom.formNoValidate, () => $.set(this.dom, 'formNoValidate', boolean))}
+
+    formTarget(): string;
+    formTarget(target: string | undefined): this;
+    formTarget(target?: string) { return $.fluent(this, arguments, () => this.dom.formTarget, () => $.set(this.dom, 'formTarget', target))}
 }
\ No newline at end of file
diff --git a/lib/$Container.ts b/lib/$Container.ts
index 8fa3693..9d6177f 100644
--- a/lib/$Container.ts
+++ b/lib/$Container.ts
@@ -23,7 +23,7 @@ export class $Container<H extends HTMLElement = HTMLElement> extends $Element<H>
     /**Insert element to this element */
     insert(children: $ContainerContentBuilder<this>): this { return $.fluent(this, arguments, () => this, () => {
         if (children instanceof Function) children = children(this);
-        children = $.multableResolve(children);
+        children = $.orArrayResolve(children);
         for (const child of children) {
             if (child === undefined) continue;
             if (child instanceof Array) this.insert(child)
diff --git a/lib/$Form.ts b/lib/$Form.ts
index 863feba..d39881d 100644
--- a/lib/$Form.ts
+++ b/lib/$Form.ts
@@ -7,9 +7,9 @@ export class $Form extends $Container<HTMLFormElement> {
         super('form', options);
     }
     
-    autocomplete(): AutoFillBase;
+    autocomplete(): AutoFill;
     autocomplete(autocomplete: AutoFill | undefined): this;
-    autocomplete(autocomplete?: AutoFill) { return $.fluent(this, arguments, () => this.dom.autocomplete, () => $.set(this.dom, 'autocomplete', autocomplete))}
+    autocomplete(autocomplete?: AutoFill) { return $.fluent(this, arguments, () => this.dom.autocomplete as AutoFill, () => $.set(this.dom, 'autocomplete', autocomplete as AutoFillBase))}
     
     action(): string;
     action(action: string | undefined): this;
@@ -43,43 +43,4 @@ export class $Form extends $Container<HTMLFormElement> {
 
     get length() { return this.dom.length }
     get elements() { return Array.from(this.dom.elements).map(ele => $(ele)) }
-}
-
-export function FormElementMethod(target: any) { return $Util.mixin(target, $FormElementMethod) }
-export abstract class $FormElementMethod {
-    abstract dom: HTMLButtonElement | HTMLInputElement;
-
-    formAction(): string;
-    formAction(action: string | undefined): this;
-    formAction(action?: string) { return $.fluent(this, arguments, () => this.dom.formAction, () => $.set(this.dom, 'formAction', action))}
-
-    formEnctype(): string;
-    formEnctype(enctype: string | undefined): this;
-    formEnctype(enctype?: string) { return $.fluent(this, arguments, () => this.dom.formEnctype, () => $.set(this.dom, 'formEnctype', enctype))}
-    
-    formMethod(): string;
-    formMethod(method: string | undefined): this;
-    formMethod(method?: string) { return $.fluent(this, arguments, () => this.dom.formMethod, () => $.set(this.dom, 'formMethod', method))}
-
-    formNoValidate(): boolean;
-    formNoValidate(boolean: boolean | undefined): this;
-    formNoValidate(boolean?: boolean) { return $.fluent(this, arguments, () => this.dom.formNoValidate, () => $.set(this.dom, 'formNoValidate', boolean))}
-
-    formTarget(): string;
-    formTarget(target: string | undefined): this;
-    formTarget(target?: string) { return $.fluent(this, arguments, () => this.dom.formTarget, () => $.set(this.dom, 'formTarget', target))}
-    
-    name(): string;
-    name(name?: string | $State<string>): this;
-    name(name?: string | $State<string>) { return $.fluent(this, arguments, () => this.dom.name, () => $.set(this.dom, 'name', name))}
-    
-    value(): string;
-    value(value?: string | $State<string>): this;
-    value(value?: string | $State<string>) { return $.fluent(this, arguments, () => this.dom.value, () => $.set(this.dom, 'value', value))}
-
-    get form() { return this.dom.form ? $(this.dom.form) : null }
-    get labels() { return Array.from(this.dom.labels ?? []).map(label => $(label)) }
-    get validationMessage() { return this.dom.validationMessage }
-    get validity() { return this.dom.validity }
-    get willValidate() { return this.dom.willValidate }
 }
\ No newline at end of file
diff --git a/lib/$Input.ts b/lib/$Input.ts
index 6ad9f56..10a7502 100644
--- a/lib/$Input.ts
+++ b/lib/$Input.ts
@@ -1,10 +1,7 @@
 import { $Element, $ElementOptions } from "./$Element";
-import { $FormElementMethod, FormElementMethod } from "./$Form";
+import { $State } from "./$State";
 
 export interface $InputOptions extends $ElementOptions {}
-//@ts-expect-error
-export interface $Input extends $FormElementMethod {}
-@FormElementMethod
 export class $Input extends $Element<HTMLInputElement> {
     constructor(options?: $InputOptions) {
         super('input', options);
@@ -152,4 +149,39 @@ export class $Input extends $Element<HTMLInputElement> {
     reportValidity() { return this.dom.reportValidity() }
     get files() { return this.dom.files }
     get webkitEntries() { return this.dom.webkitEntries }
+    
+
+    formAction(): string;
+    formAction(action: string | undefined): this;
+    formAction(action?: string) { return $.fluent(this, arguments, () => this.dom.formAction, () => $.set(this.dom, 'formAction', action))}
+
+    formEnctype(): string;
+    formEnctype(enctype: string | undefined): this;
+    formEnctype(enctype?: string) { return $.fluent(this, arguments, () => this.dom.formEnctype, () => $.set(this.dom, 'formEnctype', enctype))}
+    
+    formMethod(): string;
+    formMethod(method: string | undefined): this;
+    formMethod(method?: string) { return $.fluent(this, arguments, () => this.dom.formMethod, () => $.set(this.dom, 'formMethod', method))}
+
+    formNoValidate(): boolean;
+    formNoValidate(boolean: boolean | undefined): this;
+    formNoValidate(boolean?: boolean) { return $.fluent(this, arguments, () => this.dom.formNoValidate, () => $.set(this.dom, 'formNoValidate', boolean))}
+
+    formTarget(): string;
+    formTarget(target: string | undefined): this;
+    formTarget(target?: string) { return $.fluent(this, arguments, () => this.dom.formTarget, () => $.set(this.dom, 'formTarget', target))}
+    
+    name(): string;
+    name(name?: string | $State<string>): this;
+    name(name?: string | $State<string>) { return $.fluent(this, arguments, () => this.dom.name, () => $.set(this.dom, 'name', name))}
+    
+    value(): string;
+    value(value?: string | $State<string>): this;
+    value(value?: string | $State<string>) { return $.fluent(this, arguments, () => this.dom.value, () => $.set(this.dom, 'value', value))}
+
+    get form() { return this.dom.form ? $(this.dom.form) : null }
+    get labels() { return Array.from(this.dom.labels ?? []).map(label => $(label)) }
+    get validationMessage() { return this.dom.validationMessage }
+    get validity() { return this.dom.validity }
+    get willValidate() { return this.dom.willValidate }
 }
\ No newline at end of file
diff --git a/lib/$Select.ts b/lib/$Select.ts
index 65e1360..6d917e5 100644
--- a/lib/$Select.ts
+++ b/lib/$Select.ts
@@ -1,13 +1,9 @@
 import { $Container, $ContainerOptions } from "./$Container";
-import { $FormElementMethod, FormElementMethod } from "./$Form";
 import { $OptGroup } from "./$OptGroup";
 import { $Option } from "./$Option";
 import { $State } from "./$State";
 
 export interface $SelectOptions extends $ContainerOptions {}
-//@ts-expect-error
-export interface $Select extends $FormElementMethod {}
-@FormElementMethod
 export class $Select extends $Container<HTMLSelectElement> {
     constructor() {
         super('select')
@@ -42,6 +38,20 @@ export class $Select extends $Container<HTMLSelectElement> {
     get options() { return Array.from(this.dom.options).map($option => $($option)) }
     get selectedIndex() { return this.dom.selectedIndex }
     get selectedOptions() { return Array.from(this.dom.selectedOptions).map($option => $($option)) }
+    
+    name(): string;
+    name(name?: string | $State<string>): this;
+    name(name?: string | $State<string>) { return $.fluent(this, arguments, () => this.dom.name, () => $.set(this.dom, 'name', name))}
+    
+    value(): string;
+    value(value?: string | $State<string>): this;
+    value(value?: string | $State<string>) { return $.fluent(this, arguments, () => this.dom.value, () => $.set(this.dom, 'value', value))}
+
+    get form() { return this.dom.form ? $(this.dom.form) : null }
+    get labels() { return Array.from(this.dom.labels ?? []).map(label => $(label)) }
+    get validationMessage() { return this.dom.validationMessage }
+    get validity() { return this.dom.validity }
+    get willValidate() { return this.dom.willValidate }
 }
 
 export type $SelectContentType = $Option | $OptGroup | undefined;
\ No newline at end of file
diff --git a/lib/Router/Router.ts b/lib/Router/Router.ts
index 246cb1a..1412aae 100644
--- a/lib/Router/Router.ts
+++ b/lib/Router/Router.ts
@@ -17,7 +17,7 @@ export class Router {
 
     /**Add route to Router. @example Router.addRoute(new Route('/', 'Hello World')) */
     addRoute(routes: OrArray<Route<any>>) {
-        routes = $.multableResolve(routes);
+        routes = $.orArrayResolve(routes);
         for (const route of routes) this.routeMap.set(route.path, route);
         return this;
     }
diff --git a/package.json b/package.json
index 6efed12..384f3f4 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "name": "fluentx",
     "description": "Fast, fluent, simple web builder",
-    "version": "0.0.4",
+    "version": "0.0.5",
     "type": "module",
     "module": "index.ts",
     "author": {