upgrade normalize.css to 6.0.0 manually, close #5561

components/style/core/normalize.less

@@ -1,33 +1,23 @@
-/*! normalize.css v5.0.0 | MIT License | github.com/necolas/normalize.css */
+/*! normalize.css v6.0.0 | MIT License | github.com/necolas/normalize.css */
+
+/* Document
+   ========================================================================== */
 
 /**
- * 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.
  */
 
-/* Document
-   ========================================================================== */
-
 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-.
  */
@@ -90,7 +80,7 @@ hr {
  */
 
 pre {
-  font-family: monospace, monospace; /* 1 */ /* stylelint-disable-line font-family-no-duplicate-names */
+  font-family: monospace, monospace; /* 1 */ /* stylelint-disable-line */
   font-size: 1em; /* 2 */
 }
 
@@ -108,17 +98,7 @@ a {
 }
 
 /**
- * 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-.
+ * 1. Remove the bottom border in Chrome 57- and Firefox 39-.
  * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
  */
 
@@ -154,7 +134,7 @@ strong {
 code,
 kbd,
 samp {
-  font-family: monospace, monospace; /* 1 */ /* stylelint-disable-line font-family-no-duplicate-names */
+  font-family: monospace, monospace; /* 1 */ /* stylelint-disable-line */
   font-size: 1em; /* 2 */
 }
 
@@ -245,8 +225,7 @@ 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,
@@ -254,10 +233,7 @@ 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: @border-width-base @border-style-base #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.