AppWT 
$27Responsive by Default: The Mobile-First Design Manual
Viewport Sweeps, Horizontal-Scroll Traps, Image Strategy, and the AppWT 8-Viewport Test
The complete responsive design methodology, overflow-x traps, image strategy, viewport testing, touch-target sizing, the 8-viewport AppWT verification standard.
Who this is for: Front-end developers, UI/UX designers, agency dev teams.
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📚 What's inside this manual:
18 chapters across 150 pages. Every chapter ends with something written down that you keep.
- Chapter 1: What responsive design is, the three things it is not, and how to name your own mobile problem in one sentence.
- Chapter 2: One line of code in the page head, and the units it controls.
- Chapter 3: Pull your device split, your screen sizes and your phone-to-desktop conversion gap, then let the gap pick the pages you fix first.
- Chapter 4: A written test you can run yourself, and a defect list you can hand to anyone
- Chapter 5: A repeatable hunt for the single item that drags your whole page sideways
- Chapter 6: Replacing fixed pixel columns with layouts that size themselves from the space available
- Chapter 7: Choosing the widths where your layout changes by watching your own design instead of copying a list of handsets
- Chapter 8: Letting a card measure the space it was actually given instead of guessing from the window
- Chapter 9: Sizing, spacing and loading text so a phone reader never has to squint
- Chapter 10: Sending one large file to every visitor, and what to send instead.
- Chapter 11: Embedded frames, phone video, and the third-party layer that quietly takes your screen
- Chapter 12: The two measures a phone user feels in their hands, and the fix for each
- Chapter 13: Rebuilding the top of the page around one hand and a short screen
- Chapter 14: Why the wrong thing gets tapped, and the sizes and spacing that stop it
- Chapter 15: Keyboards, autofill, validation and payment on a screen held in one palm
- Chapter 16: The accessibility checks that repair phone faults at the same time
- Chapter 17: How to find, change and undo a mobile layout fault when the site sits in a platform you did not build
- Chapter 18: A standing routine that stops the site drifting back
Common Questions
How long is Responsive by Default: The Mobile-First Design Manual?
It runs 150 pages, in 5 parts and 18 chapters.
Who wrote Responsive by Default: The Mobile-First Design Manual?
Anthony "Tony" Paris, founder of AppWT Web & AI Solutions, published by AppWT Web & AI Solutions (AppWT LLC).
What format is it?
A PDF you can read on any device and print for your own use. Copying and editing are disabled; printing is not.
What does it cost?
$27 once, for you and your team. There is no subscription.
Can I read part of it first?
Yes. The preview shows the front matter, the full contents, and the first ten pages of chapter one.
What is Responsive by Default about?
Responsive by Default is subtitled The Mobile-First Design Manual. Responsive by Default is a mobile-first design manual for anyone whose site looks fine on the desktop they built it on and breaks on the phone the customer actually holds. It opens on that exact gap, the page you approved against the page they got, and then gives you a repeatable method to close it. The book suits designers, developers, and site owners who need pages that hold together on every screen, not just the one in front of them.
Who wrote Responsive by Default?
Anthony "Tony" Paris. Anthony "Tony" Paris is the founder of AppWT Web & AI Solutions and the author of the AppWT Manuals series. He started building websites in 1997 in Flint, Michigan, and has spent the years since building and protecting them for business owners across Michigan, Metro Detroit, and beyond. Responsive by Default is published under ISBN 979-8-952262-38-6.
Is Responsive by Default written by a web design agency?
Yes. Responsive by Default is written and published by AppWT Web & AI Solutions (AppWT LLC), a Detroit-based web design and AI practice working since 1997, incorporated in Michigan as AppWT LLC in 2020, through its publishing imprint AppWT Manuals. It is a full published book with its own ISBN, 979-8-952262-38-6, not a marketing PDF or a white paper.
Who publishes Responsive by Default?
AppWT Web & AI Solutions (AppWT LLC), through its publishing imprint AppWT Manuals at manuals.appwt.com. AppWT is a digital agency, so this is a book published by an agency rather than by a trade publisher.
What is the ISBN of Responsive by Default?
979-8-952262-38-6.
When was Responsive by Default published?
August 1, 2026, by AppWT Web & AI Solutions (AppWT LLC). ISBN 979-8-952262-38-6.
What subjects does Responsive by Default cover?
Design, Computer Software. Specific topics include mobile; web development book; developer handbook.
Where can I read Responsive by Default?
https://manuals.appwt.com/mobile-responsive-design/