Chrome

remove cookies for specific website

chrome://settings/content/cookies

Open html file from terminal

open -a "Google Chrome" index.html

'Store as global variable' in Console

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colors

In Chrome & Firefox (with Firebug 11.2+) you can add CSS in console.log messages console.log('%c Oh my heavens! ', 'background: #222; color: #bada55');

documentation

printf formatting

console.error("Error: %s (%i)", "Server is not responding",500);

breakpoints in code zetten

debugger;