Popup Error Example 1: no reference to error message

Features

label[for] element is used to label form control.
HTML5 required attribute to identify a form control is required.
aria-invalid attribute is used to identify a form control has an invalid value.

Pizza Order Form

Name

Address

Phone

Delivery Method

Crust

Thin

Classic

Deep Dish

Toppings

Sausage

Pepperoni

Mushrooms

Onions

Green Peppers

Back Olives

Extra cheese

HTML Source Code

CSS Source Code

Javascript Source Code