gajus/usus

Multiple viewports, mobile + non-mobile

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#8 opened on Jul 8, 2017

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 (10 comments) (1 reaction) (0 assignees)JavaScript (800 stars) (33 forks)batch import
enhancementhelp wanted

Description

Is there a way to call usus to obtain a single stylesheet with "critical" CSS for all possible viewport sizes, and mobile and retina options?

Motivation: We don't know the client's viewport size on the server side, so the critical CSS should include the necessary CSS for all viewport sizes.

Contributor guide

Tech stack
javascriptnodejs
Domain
performancebackend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Understanding of critical CSSNode.js experience
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate how to generate critical CSS for different viewport sizes simultaneously. Look at the current implementation in usus, likely in the lib/ directory. Review the issue comments for any suggested approaches. Consider using Puppeteer's device emulation or rendering the page at multiple viewports and merging the critical CSS.