// attribute should be nested
input[type='text']
  border: 0

// attribute should be nested
input[type='radio']
  color: red

// attribute should be nested
a[target='_blank']
  content: ''

input
  &[type='text']
    content: ''

form
  // attribute should be nested
  input[type='text']
    padding: 0

.form
  // attribute should be nested
  .class input[type='text']
    padding: 0