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MODULE 03 · BEGINNER

Accessible Forms, HTML5 Inputs, and the Constraint Validation APIHTML & Modern Web Development · Module 3

Engineer production web forms: HTTP transmission enctypes, modern HTML5 input types, the native Constraint Validation API, accessible fieldsets/labels, and Project 1: Accessible Checkout Form.

5 lessons20 min readingYour First Pages & Semantic Structure1 project
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WHAT THIS MODULE COVERS

Accessible Forms, HTML5 Inputs, and the Constraint Validation API

Engineer production web forms: HTTP transmission enctypes, modern HTML5 input types, the native Constraint Validation API, accessible fieldsets/labels, and Project 1: Accessible Checkout Form.

BEFORE YOU START

Semantic HTML structure.

WHAT YOU’LL BE ABLE TO DO

Design accessible forms with fieldsets, legends, specialized mobile input types, autocomplete attributes, and client-side Constraint Validation.

THE LESSON SEQUENCE

Read in order, or jump to what you need.

Every lesson builds on the one before it. Open any lesson to read the explanation, run the examples, and try the practice challenges.

  1. 03.01
    The Anatomy of HTML Forms: GET, POST, and Encoding Types

    Deconstruct HTML form transmission: HTTP methods (GET vs POST), content encoding types (application/x-www-form-urlencoded, multipart/form-data), and action targets.

    4 min
  2. 03.02
    Modern HTML5 Input Types, Mobile Keyboards, and Attributes

    Leverage modern HTML5 inputs: email, tel, number, url, date, color, inputmode keyboard triggers, autocomplete tokens, and min/max/step constraints.

    4 min
  3. 03.03
    The HTML5 Constraint Validation API: Native Form Validation

    Harness browser-native validation without heavy JavaScript: checkValidity(), reportValidity(), setCustomValidity(), validity state flags, and CSS pseudo-classes (:valid, :invalid).

    4 min
  4. 03.04
    Accessible Form Controls: Labels, Fieldsets, Legends, and ARIA Descriptions

    Master accessible form architecture: explicit <label for> associations, grouping radio/checkbox sets with <fieldset> and <legend>, and linking helper text via aria-describedby.

    4 min
  5. 03.05
    Guided Project 1: Multi-Step Accessible E-Commerce Checkout FormProject

    Engineer an industrial-grade, fully accessible e-commerce checkout form implementing semantic fieldsets, mobile input types, browser autofill tokens, and custom Constraint Validation.

    4 min
MODULE SELF-CHECK

Ready to move on?

Implement a production e-commerce checkout form with accessible error announcements and focus management.

Open the module self-check