7.0.0

• Use the default user interface font in all browsers (opinionated).
• Use the default monospace user interface font in all browsers (opinionated).
• Use a 4-space tab width in all browsers (opinionated).
• Fix correction of cursor style of increment and decrement buttons
  in Safari, not Chrome.
• Correct the text style of placeholders in Chrome, Edge, and Safari.
• Remove unnecessary form control margin normalizations in Firefox.
• Remove opinionated fieldset padding in all browsers.
• Remove ::-moz-focus-inner and :-moz-focusring normalizations
  fixed in Firefox 53
  https://bugzilla.mozilla.org/show_bug.cgi?id=140562