normalize

Correct block display not defined in IE 8/9.

1. Set default font family to sans-serif.
2. Prevent iOS text size adjust after orientation change, without disabling user zoom.

Remove default margin.

Correct block display not defined for any HTML5 element in IE 8/9. Correct block display not defined for details or summary in IE 10/11 and Firefox. Correct block display not defined for main in IE 11.

1. Correct inline-block display not defined in IE 8/9.
2. Normalize vertical alignment of progress in Chrome, Firefox, and Opera.

Prevent modern browsers from displaying audio without controls. Remove excess height in iOS 5 devices.

Address [hidden] styling not present in IE 8/9/10. Hide the template element in IE 8/9/11, Safari, and Firefox < 22.

Remove the gray background color from active links in IE 10.

Improve readability when focused and also mouse hovered in all browsers.

Address styling not present in IE 8/9/10/11, Safari, and Chrome.

Address style set to bolder in Firefox 4+, Safari, and Chrome.

Address styling not present in Safari and Chrome.

Address variable h1 font-size and margin within section and article contexts in Firefox 4+, Safari, and Chrome.

Address styling not present in IE 8/9.

Address inconsistent and variable font size in all browsers.

Prevent sub and sup affecting line-height in all browsers.

Remove border when inside a element in IE 8/9/10.

Correct overflow not hidden in IE 9/10/11.

Address margin not present in IE 8/9 and Safari.

Address differences between Firefox and other browsers.

Contain overflow in all browsers.

Address odd em-unit font size rendering in all browsers.

Known limitation: by default, Chrome and Safari on OS X allow very limited styling of select, unless a border property is set.

1. Correct color not being inherited. Known issue: affects color of disabled elements.
2. Correct font properties not being inherited.
3. Address margins set differently in Firefox 4+, Safari, and Chrome.

Address overflow set to hidden in IE 8/9/10/11.

Address inconsistent text-transform inheritance for button and select. All other form control elements do not inherit text-transform values. Correct button style inheritance in Firefox, IE 8/9/10/11, and Opera. Correct select style inheritance in Firefox.

1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native audio and video controls.
2. Correct inability to style clickable input types in iOS.
3. Improve usability and consistency of cursor style between image-type input and others.

Re-set default cursor for disabled elements.

Remove inner padding and border in Firefox 4+.

Address Firefox 4+ setting line-height on input using !important in the UA stylesheet.

It’s recommended that you don’t attempt to style these elements. Firefox’s implementation doesn’t respect box-sizing, padding, or width.

1. Address box sizing set to content-box in IE 8/9/10.
2. Remove excess padding in IE 8/9/10.

Fix the cursor style for Chrome’s increment/decrement buttons. For certain font-size values of the input, it causes the cursor style of the decrement button to change from default to text.

1. Address appearance set to searchfield in Safari and Chrome.
2. Address box-sizing set to border-box in Safari and Chrome (include -moz to future-proof).

Remove inner padding and search cancel button in Safari and Chrome on OS X. Safari (but not Chrome) clips the cancel button when the search input has padding (and textfield appearance).

Define consistent border, margin, and padding.

1. Correct color not being inherited in IE 8/9/10/11.
2. Remove padding so people aren’t caught out if they zero out fieldsets.

Remove default vertical scrollbar in IE 8/9/10/11.

Don’t inherit the font-weight (applied by a rule above). NOTE: the default cannot safely be changed in Chrome and Safari on OS X.

Remove most spacing between table cells.