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@paulirish
paulirish / what-forces-layout.md
Last active September 11, 2025 10:17
What forces layout/reflow. The comprehensive list.

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics
  • elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
@jamestalmage
jamestalmage / How_Require_Extensions_Work.md
Last active February 28, 2024 18:22
Breakdown of How Require Extensions Work

Why

Doing require extensions correctly is essential, because:

  1. Users should be able to install multiple extensions in succession, and have them work together.
  2. Coverage tools like nyc need it to reliably supply coverage information that takes into account sourcemaps from upstream transforms.
  3. Because non-standard, un-predictable behavior causes hard to solve bugs, and major headaches for project maintainers.

What is a require extension anyways?

@Restuta
Restuta / framework-sizes.md
Last active June 11, 2025 03:17
Sizes of JS frameworks, just minified + minified and gzipped, (React, Angular 2, Vue, Ember)

Below is the list of modern JS frameworks and almost frameworks – React, Vue, Angular, Ember and others.

All files were downloaded from https://cdnjs.com and named accordingly. Output from ls command is stripped out (irrelevant stuff)

As-is (minified)

$ ls -lhS
566K Jan 4 22:03 angular2.min.js
@kmck
kmck / matte-color.scss
Created June 9, 2016 21:36
SCSS mixin to flatten a color against another color
// ## matte
//
// Calculate the color created by flattened the input color against a base color with an opacity
//
// @param {Color} $color: foreground color
// @param {Color} [$matte]: background color (or `transparent`) to matte the foreground against
// @param {Number} [$opacity]: mixing opacity of the foreground color, analogous to layer opacity
// in an image editor
// @return {Color} the matted color
# Name Type 1 Type 2 Total HP Attack Defense Sp. Atk Sp. Def Speed Generation Legendary
1 Bulbasaur Grass Poison 318 45 49 49 65 65 45 1 False
2 Ivysaur Grass Poison 405 60 62 63 80 80 60 1 False
3 Venusaur Grass Poison 525 80 82 83 100 100 80 1 False
3 VenusaurMega Venusaur Grass Poison 625 80 100 123 122 120 80 1 False
4 Charmander Fire 309 39 52 43 60 50 65 1 False
5 Charmeleon Fire 405 58 64 58 80 65 80 1 False
6 Charizard Fire Flying 534 78 84 78 109 85 100 1 False
6 CharizardMega Charizard X Fire Dragon 634 78 130 111 130 85 100 1 False
6 CharizardMega Charizard Y Fire Flying 634 78 104 78 159 115 100 1 False
@nicroto
nicroto / server.js
Created September 27, 2016 14:46
NodeJS server for a single-page app with client navigation and no backend.
'use strict';
var http = require( "http" ),
pathUtils = require( "path" ),
express = require( "express" ),
app = express(),
PORT = process.env.PORT || 5000,
appDir = pathUtils.resolve( __dirname, "client" );
app.use( express.static( appDir ) );
@carl0zen
carl0zen / styled-components-mixin-example.jsx
Last active December 8, 2021 05:51
Styled Components Mixin example
// Mixin like functionality
const textInput = props => `
color: ${props.error ? color.white : color.base};
background-color: ${props.error ? color.alert : color.white};
`;
export const Input = styled.input`
${textInput}
`;
@DavidWells
DavidWells / aligning-images.md
Last active September 4, 2025 07:38
Guide to aligning images in github readme.md files. https://davidwells.io/snippets/how-to-align-images-in-markdown

Aligning images

This is a guide for aligning images.

See the full Advanced Markdown doc for more tips and tricks

left alignment

@tzmartin
tzmartin / m3u8-to-mp4.md
Last active July 27, 2025 05:36
m3u8 stream to mp4 using ffmpeg

1. Copy m3u8 link

Alt text

2. Run command

echo "Enter m3u8 link:";read link;echo "Enter output filename:";read filename;ffmpeg -i "$link" -bsf:a aac_adtstoasc -vcodec copy -c copy -crf 50 $filename.mp4
@timneutkens
timneutkens / index.js
Last active February 14, 2025 21:45
Clear console/terminal in node.js the right way
const readline = require('readline')
const blank = '\n'.repeat(process.stdout.rows)
console.log(blank)
readline.cursorTo(process.stdout, 0, 0)
readline.clearScreenDown(process.stdout)