How deeply does Web Design Playground, Second Edition cover breakpoint?

Explains media-query implementation and content-driven selection, but stops short of cataloging device-specific widths.

Breakpoint

As explained in Web Design Playground, Second Edition

A breakpoint is a width or other threshold at which a responsive design changes its layout or styling.

A breakpoint is a width threshold where responsive CSS changes the layout or styling. For example, a page can switch from a three-column grid to stacked content at 450px. section 14.4

Choose breakpoints by watching the content, not by collecting device widths:

Use min-width or max-width media queries to apply changes when the layout becomes difficult to read or too narrow. section 14.4
Test different screen widths and set the threshold where readable line lengths or the overall layout begin to fail. section 14.4
Avoid targeting every named device; constantly changing screen sizes make device-specific breakpoints brittle. section 14.4

A layout breakpoint

At widths above 450px, the page uses a three-column grid. At 450px or less, a media query changes the grid to one column and reduces the h1 size to 24px.

How Web Design Playground, Second Edition covers it

Cover of Web Design Playground, Second Edition

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Also explained in

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CSS in Depth, Second EditionA responsive-design breakpoint is a viewport or container condition at which styles switch between predefined layout or presentation configurations.

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Related concepts

responsive web designused by · Responsive web design is an approach to designing websites whose layouts and presentation adapt to different screen sizes, viewports, and device characteristics.
media queryused by · A media query is a CSS conditional rule that applies styles when specified media types or presentation-environment features match.
layoutconfigures · A D3 layout is a preprocessing function that transforms a dataset into an annotated dataset containing attributes needed to draw a visualization.
emuses · The em is a CSS relative length unit whose computed value is based on the applicable font size.
fluid layoutcontrasts with · A fluid layout is a web layout whose dimensions adapt continuously to changes in available viewport space.
viewportequivalent to · A viewport is the visible region through which a browser or graphical interface displays a document or content.

This explainer was generated by Manning's knowledge graph from the text of Web Design Playground, Second Edition. The section links point to the parts of the book it draws on.