Remove all opinionated rules (necolas#649)

- Remove changing the default font family in all browsers.
- Remove the removal of margin on body in all browsers.
- Remove the removal of outline on focused links when they are also
active or hovered in all browsers (opinionated).
- Remove changing the font styles of input controls in all browsers.
- Remove the changing of border, margin, and padding of fieldsets in
all browsers.

Author: jonathantneal

normalize.css

@@ -4,30 +4,20 @@
    ========================================================================== */
 
 /**
- * 1. Change the default font family in all browsers (opinionated).
- * 2. Correct the line height in all browsers.
- * 3. Prevent adjustments of font size after orientation changes in
+ * 1. Correct the line height in all browsers.
+ * 2. Prevent adjustments of font size after orientation changes in
  *    IE on Windows Phone and in iOS.
  */
 
 html {
-  font-family: sans-serif; /* 1 */
-  line-height: 1.15; /* 2 */
-  -ms-text-size-adjust: 100%; /* 3 */
-  -webkit-text-size-adjust: 100%; /* 3 */
+  line-height: 1.15; /* 1 */
+  -ms-text-size-adjust: 100%; /* 2 */
+  -webkit-text-size-adjust: 100%; /* 2 */
 }
 
 /* Sections
    ========================================================================== */
 
-/**
- * Remove the margin in all browsers (opinionated).
- */
-
-body {
-  margin: 0;
-}
-
 /**
  * Add the correct display in IE 9-.
  */
@@ -107,16 +97,6 @@ a {
   -webkit-text-decoration-skip: objects; /* 2 */
 }
 
-/**
- * Remove the outline on focused links when they are also active or hovered
- * in all browsers (opinionated).
- */
-
-a:active,
-a:hover {
-  outline-width: 0;
-}
-
 /**
  * 1. Remove the bottom border in Firefox 39-.
  * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
@@ -245,19 +225,15 @@ svg:not(:root) {
    ========================================================================== */
 
 /**
- * 1. Change the font styles in all browsers (opinionated).
- * 2. Remove the margin in Firefox and Safari.
+ * Remove the margin in Firefox and Safari.
  */
 
 button,
 input,
 optgroup,
 select,
 textarea {
-  font-family: sans-serif; /* 1 */
-  font-size: 100%; /* 1 */
-  line-height: 1.15; /* 1 */
-  margin: 0; /* 2 */
+  margin: 0;
 }
 
 /**
@@ -316,16 +292,6 @@ button:-moz-focusring,
   outline: 1px dotted ButtonText;
 }
 
-/**
- * Change the border, margin, and padding in all browsers (opinionated).
- */
-
-fieldset {
-  border: 1px solid #c0c0c0;
-  margin: 0 2px;
-  padding: 0.35em 0.625em 0.75em;
-}
-
 /**
  * 1. Correct the text wrapping in Edge and IE.
  * 2. Correct the color inheritance from `fieldset` elements in IE.