mathiasbynens

const normalizeTimeZone = (timeZone) => {
  const dtf = new Intl.DateTimeFormat('en-US', { timeZone });
  const normalized = dtf.resolvedOptions().timeZone;
  console.log(`${timeZone} → ${normalized}`);
  return normalized;
};

// https://github.com/justingrant/proposal-canonical-tz#3-fix-out-of-date-canonicalizations-in-v8webkit
normalizeTimeZone('Africa/Asmara');
normalizeTimeZone('Africa/Asmera');

mathiasbynens

// This object contains a string value that in contains a single quote,
// a double quote, a backtick, and a backslash.
const data = { foo: `a'b"c\`d\\e` };

// Turn the data into its JSON-stringified form.
const json = JSON.stringify(data);

// Now, we want to insert the data into a script body as a JavaScript
// string literal per https://v8.dev/blog/cost-of-javascript-2019#json,
// escaping special characters like `"` in the data.

mathiasbynens

http://AI./
└ IP: 209.59.119.34
http://ARAB./
└ IP: 127.0.53.53
http://BH./
└ IP: 10.10.10.10
http://CM./
└ IP: 195.24.205.60
http://DK./
└ IP: 193.163.102.58

mathiasbynens

node_modules
package-lock.json

mathiasbynens

const compare = (versionA, versionB) => {
	// TODO: Does there exist a path for which every single Unicode version
	// gets new entries? If so, use that instead.
	const path = 'General_Category/Other_Letter';
	const before = new Set(require(
		`unicode-${ versionA }/${ path }/code-points.js`
	));
	const after = require(
		`unicode-${ versionB }/${ path }/code-points.js`
	);

mathiasbynens

Looking for support tables for HTML/CSS/JavaScript features or details on their implementation status in major browsers?

• Chrome Platform Status (covers Chromium and thus includes Opera)
• Firefox Platform Status
• Microsoft Edge Platform Status
• WebKit Feature Status
• API Catalog

And then there’s Can I use…?.

mathiasbynens

#!/usr/bin/env bash

# https://code.google.com/p/chromium/issues/detail?id=226801
url='https://chromium.googlesource.com/chromium/src/net/+/master/http/transport_security_state_static.json?format=TEXT';
curl -#s "${url}" | \
	base64 --decode | \
	sed '/^ *\/\// d' | \
	sed '/^\s*$/d' > hsts.json;

mathiasbynens

'use strict';

const pad = function(string) {
	const totalCharacters = 4;
	return string.length < totalCharacters ?
		(Array(totalCharacters + 1).join('0') + string).slice(-totalCharacters) :
		string;
}

const UNICODE_MIN = 0x0;

mathiasbynens

superfish.pem contains:

1. the Superfish certificate as found by both Chris Palmer and Matt Burke;
2. the encrypted private key as found by Karl Koscher.

$ openssl x509 -in superfish.pem -text
Certificate:
    Data:
        Version: 3 (0x2)

mathiasbynens

[\x80-\uD7FF\uDC00-\uFFFF]|[\uD800-\uDBFF][\uDC00-\uDFFF]|[\uD800-\uDBFF]