Josh W. Comeau

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Explanatory writing on web-development concepts

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SI Score: 80/100
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Web Development css technical-writing

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What it does

Josh W. Comeau publishes web-development articles, including detailed discussion of CSS and browser features.

Use the interactive Flexbox guide to change a container width or CSS property, compare the visible layout and study the companion CSS. It covers direction, alignment, sizing and wrapping for beginners and experienced Flexbox users. The guide was updated April 27, 2026. Prefer a desktop, laptop or tablet: the author warns that some demos work poorly on smaller screens.

Sources

Josh W. Comeau (Oct 26, 2026)
An Interactive Guide to Flexbox in CSS • Josh W. Comeau (Oct 26, 2026)

SI Score

80/100

#1 in Learn to Code

Based on published information. No hands-on task test.

Method 2.0 · Published source review Assessed Oct 26, 2026Score ceiling for this evidence: 84/100.

Product usefulness 80

Evidence

The guide connects adjustable CSS inputs, visible layout results, explanations and reusable code for a documented CSS audience, with an explicit smaller-device limit. This supports a complete tutorial workflow at 80.

Limits: AI review of saved source passages. No hands-on test, human approval or automatic-provider checker receipt.

Source links and check dates are in Sources and checks below.

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Policy links do not verify a company's conduct. An HTML response time is not application speed. Tracker and accessibility checks miss behavior after page load. Copyright dates do not prove product upkeep.

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Unconfirmed details may be unassessed, absent from the pages checked or temporarily unreadable. A missing price does not mean the service is free.

Sources and checks

Supporting pages for product usefulness, site facts, prices and separate website checks. Each record keeps its own date. Reading a page does not establish how well the product performs in use.

www.joshwcomeau.com/
- Product usefulness evidenceChecked Oct 26, 2026
www.joshwcomeau.com/css/interactive-guide-to-flexbox/
- Product usefulness evidenceChecked Oct 26, 2026

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