npx skills add https://github.com/patternsdev/skills
thedaviddias/front-end-checklist
import-on-visibility
Use when reviewing long pages, dashboards, or content feeds with expensive offscreen modules. Balance early enough loading for smooth scrolling against keeping the initial route light.
Installation
$
npx skills add thedaviddias/front-end-checklist --skill import-on-visibility
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More details
Agent compatibility
Declared targets from SKILL.md / docs. Unmarked agents are not listed — the skill may still install via the CLI.
Claude Code
Not declared
Cursor
Not declared
Codex
Not declared
GitHub Copilot
Not declared
Windsurf
Not declared
Gemini CLI
Not declared
Cline
Not declared
OpenCode
Not declared
Also listed on
Alternate registries and mirrors of this skill.
Repository health
Stars
74.1K
License
MIT
Default branch
main
Open issues
5
Status
Active
Skill metadata
Parsed from SKILL.md frontmatter.
More metadata
- category
- performance
- priority
- high
- difficulty
- intermediate
- estimatedTime
- 20
- source
- frontendchecklist.io
- url
- https://frontendchecklist.io/en/rules/performance/import-on-visibility
Package contents
Files included with this skill beyond the listing page.
-
skill md
SKILL.md2,134 B -
docs
SUMMARY.md212 B
History
- First seen on skills.sh
- First recorded snapshot · 8 installs
SKILL.md
Load non-critical code when content approaches the viewport
Many pages ship JavaScript for offscreen sections that a user may never reach. Import-on-visibility keeps the initial route lighter while still loading content early enough to feel ready when users scroll to it.
Quick Reference
- Use Intersection Observer to start loading code before an offscreen section becomes visible
- Reserve space with placeholders or skeletons so deferred sections do not cause layout shift
- Tune
rootMarginso heavy content loads early enough without competing with above-the-fold work - Use this for charts, reviews, related products, embeds, and offscreen dashboards
Check
Identify components, widgets, or modules that load on first render even though they only appear after the user scrolls. Flag which ones can switch to visibility-based loading.
Fix
Use Intersection Observer or an equivalent framework primitive to load the offscreen component or dependency when it approaches the viewport, while preserving layout stability and a clear placeholder.
Explain
Explain import-on-visibility, how it differs from import-on-interaction, and how viewport-based loading helps large pages stay fast.
Code Review
Inspect scroll-triggered sections, embeds, charts, recommendation modules, and long landing pages. Flag code that is bundled eagerly even though the corresponding UI stays offscreen until later, and verify the deferred version still loads before the user reaches it.
For full implementation details, code examples, and framework-specific guidance, see references/rule.md.
Rule page: https://frontendchecklist.io/en/rules/performance/import-on-visibility