Owner

LeaVerou

37 indexed repositories · View on GitHub

animatable
One property, two values, endless possiblities

HTML · 2574 stars
bliss
Blissful JavaScript

JavaScript · 2389 stars
css3patterns
The popular CSS3 patterns gallery, now on Github :)

HTML · 1454 stars
stretchy
Form element autosizing, the way it should be

JavaScript · 1272 stars
dabblet
An interactive CSS playground

JavaScript · 827 stars
dpi
dpi love - Easily find the DPI/PPI of any screen

JavaScript · 771 stars
multirange
A tiny polyfill for HTML5 multi-handle sliders

CSS · 607 stars
style-observer
Run JS when a CSS property changes. Any CSS property.

JavaScript · 542 stars
conic-gradient
Polyfill for conic-gradient() and repeating-conic-gradient()

HTML · 484 stars
rety
Record typing on one or more editors and replay it at will, to simulate live coding

JavaScript · 404 stars
parsel
A tiny, permissive CSS selector parser

TypeScript · 397 stars
md-block
A custom element for rendering stylable (light DOM) Markdown

JavaScript · 357 stars
regexplained

JavaScript · 276 stars
chainvas
Make APIs suck less

HTML · 263 stars
css.land
Hands on CSS demos

HTML · 230 stars
cubic-bezier
Playground for CSS bezier-based timing functions

JavaScript · 184 stars
rgba.php
Script for automatic generation of one pixel alpha-transparent images for non-RGBA browsers to easily emulate RGBA colors in backgrounds

PHP · 178 stars
HTML5-Progress-polyfill
Polyfill for the HTML5 <progress> element

JavaScript · 178 stars
markapp
Building apps by authoring HTML

CSS · 133 stars
duoload
Simple, client-side comparison of website loading behavior

JavaScript · 132 stars
17 more repositories live on View on GitHub

Beginner friendly Everything

Open All

Bug: 0.5px difference in width between bug and github icon Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 58/100

LeaVerou/blog#145 · Opened Sep 3, 2026
`extend()` overwrites `[own]` getters that `defineOwnProperty` is supposed to protect Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

LeaVerou/xtensible#4 · 1 comment · Opened Jun 29, 2026
Unexpected behavior and potential memory leaks when calling unobserve() Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

LeaVerou/style-observer#142 · Opened Jun 4, 2026
first_ prefix doesn't work for instance hooks like first_constructor Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

LeaVerou/xtensible#3 · 1 comment · Opened Jun 1, 2026
Support option to move `--style-observer-transition` property to be defined under a class instead of inlined Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

LeaVerou/style-observer#141 · 2 comments · Opened Mar 18, 2026
`RenderedObserver` does not work with `display: contents` element Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

LeaVerou/style-observer#140 · Opened Feb 10, 2026
Bug: Broken links to `LeaVerou/lea.verou.me` Github repo Open

bug

LeaVerou/blog#131 · 1 comment · 1 assignee · Opened Dec 27, 2025
Publish v2 alpha checklist Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

LeaVerou/bliss#264 · 5 comments · Opened Dec 20, 2025
chore: Publish v2 as alpha Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

LeaVerou/bliss#263 · 3 comments · Opened Dec 17, 2025
Sharing spread properties Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

LeaVerou/proposal-class-spread#5 · Opened Nov 20, 2025
Overview example clarification Open

Difficulty 1/5 Under an hour Newbie friendliness 58/100

LeaVerou/proposal-class-spread#4 · Opened Nov 20, 2025
private fields: good use case for the private declarations proposal Open

Difficulty 5/5 Over a week Newbie friendliness 18/100

LeaVerou/proposal-class-spread#3 · 1 comment · Opened Nov 11, 2025
Adding methods that use fields Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

LeaVerou/proposal-class-spread#2 · 1 comment · Opened Nov 8, 2025
Broken page: Blog Open

broken-page

Difficulty 3/5 1-2 days Newbie friendliness 35/100

LeaVerou/blog#124 · Opened Oct 21, 2025
Looking for a modern, super-lightweight alternative for DOM manipulation? Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

LeaVerou/bliss#261 · Opened Oct 12, 2025
Add framework laptop (13/16) screens Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

LeaVerou/dpi#268 · Opened Sep 5, 2025
Make URL more forgiving of formatting Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

LeaVerou/cubic-bezier#33 · Opened Sep 4, 2025
The `StyleObserver` constructor doesn't accept single values as the values of the `properties` and `targets` options Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

LeaVerou/style-observer#136 · 2 comments · Opened Jul 19, 2025
Dark mode Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

LeaVerou/blog#108 · 1 comment · Opened Jul 9, 2025
Option to link to post instead of liked-by Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

LeaVerou/bluesky-likes#20 · Opened Jun 25, 2025
Logo not showing when bundled Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

LeaVerou/bluesky-likes#19 · 1 comment · Opened Jun 25, 2025
Perf optimization: Allow passing a property definition Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

LeaVerou/style-observer#134 · 2 reactions · Opened Jun 9, 2025
Show something meaningful if the post URL is wrong or the post doesn't exist (anymore) Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

LeaVerou/bluesky-likes#12 · 1 comment · Opened Jun 8, 2025
Document that any custom property being observed must had been set before observer Open

bug

LeaVerou/style-observer#133 · 9 comments · 1 assignee · Opened Jun 7, 2025
Likers: Use View Transitions for loading? Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 30/100

LeaVerou/bluesky-likes#4 · Opened Jun 5, 2025
Likes: Like post and show like status Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

LeaVerou/bluesky-likes#3 · Opened Jun 5, 2025
Likers: Should the `loading` state wait until all avatars have loaded? Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

LeaVerou/bluesky-likes#1 · Opened Jun 5, 2025
High performance option (`oldValues`?) Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

LeaVerou/style-observer#126 · Opened Jun 1, 2025
Generalize the shadow host handling via a `selector` option? Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

LeaVerou/style-observer#125 · Opened Jun 1, 2025
Existing transition is overwritten in Firefox when there is more than one `transition-property` Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

LeaVerou/style-observer#113 · 3 comments · Opened May 19, 2025
fix link rot https://projects.verou.me/CONTRAST-RATIO Open

LeaVerou/blog#93 · 1 assignee · Opened Mar 24, 2025
`marked` has changed the path for its latest source code Open

Difficulty 1/5 Under an hour Newbie friendliness 55/100

LeaVerou/md-block#26 · 6 comments · Opened Mar 16, 2025
Provide method third-party scripts can call which check which properties have changed and fires the callback if any Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

LeaVerou/style-observer#88 · Opened Feb 21, 2025
An idea for how we can observe changes caused due to animations Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

LeaVerou/style-observer#87 · 2 comments · Opened Feb 21, 2025
The website is not open Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

LeaVerou/play.csssecrets.io#5 · 1 comment · Opened Feb 18, 2025
Implement `immediate` option Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

LeaVerou/style-observer#45 · 1 reaction · Opened Feb 5, 2025
Undocumented browser bugs Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

LeaVerou/style-observer#42 · 3 comments · Opened Feb 4, 2025
Can not access http://play.csssecrets.io/ Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

LeaVerou/play.csssecrets.io#4 · Opened Jan 31, 2025
radius issues Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

LeaVerou/chainvas#16 · Opened Dec 27, 2024
Header style conflicts on specific version of Safari Open

broken-page

Difficulty 3/5 1-2 days Newbie friendliness 45/100

LeaVerou/blog#73 · Opened Nov 15, 2024
Pattern update with modern CSS Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

LeaVerou/css3patterns#163 · 1 comment · 2 reactions · Opened Nov 5, 2024
Broken page: Page Not Found: lea.verou.me/tag/css-secrets/ Open

broken-page

Difficulty 3/5 1-2 days Newbie friendliness 42/100

LeaVerou/blog#69 · Opened Oct 1, 2024
Feature request: Support block alerts Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

LeaVerou/md-block#25 · Opened Sep 20, 2024
Feature request: footnote support Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

LeaVerou/md-block#23 · 1 comment · Opened Sep 19, 2024
Errors when using jest and jsdom Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

LeaVerou/parsel#79 · 1 reaction · Opened Sep 9, 2024
Certificate issues Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

LeaVerou/bytesizematters#1 · Opened Jul 29, 2024
Table of contents inaccessible on zoom/large font size Open

broken-page

Difficulty 3/5 1-2 days Newbie friendliness 45/100

LeaVerou/blog#64 · Opened Jun 19, 2024
Nesting selectors like `& > button` cannot be parsed Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

LeaVerou/parsel#77 · 4 comments · Opened Jun 14, 2024
Don’t use a fixed increment, use current precision Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

LeaVerou/incrementable#16 · Opened Apr 23, 2024
v2 non-esm version Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

LeaVerou/bliss#260 · 1 comment · 1 reaction · Opened Apr 18, 2024

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