gistfile1.txt

var i = 0;
function fillLocalStorage(size) {
  try {
    window.localStorage.setItem('data'+i++, new Array(size).join('a'));
  } catch(e) {
    if(size == 1) {
      throw e;
    } else {
      return fillLocalStorage(Math.floor(size / 2));
    }
  }
  console.log('Added ' + size);
  fillLocalStorage(size);
}
fillLocalStorage(1024 * 1024);