docs: clarify npm/yarn commands, add blank lines to mix md/html in table (#21606)

PR Close #21606

aio/content/guide/browser-support.md

@@ -6,146 +6,91 @@ Angular supports most recent browsers. This includes the following specific vers
 
   <tr>
 
-    <th>
+<th>
+      Browser
+</th>
+
+<th>
+      Supported versions
+</th>
+
+  </tr>
+
+  <tr>
+
+    <td>
       Chrome
-    </th>
+    </td>
 
-    <th>
+    <td>
+      latest
+    </td>
+  </tr>
+
+  <tr>
+
+    <td>
       Firefox
-    </th>
+    </td>
 
-    <th>
+    <td>
+      latest
+    </td>
+  </tr>
+
+  <tr>
+
+    <td>
       Edge
-    </th>
+    </td>
 
-    <th>
+    <td>
+      2 most recent major versions
+    </td>
+  </tr>
+  <tr> 
+    <td>
       IE
-    </th>
+    </td>
-
+    <td>
-    <th>
+      11<br>10<br>9
-      Safari
+    </td>
-    </th>
+  </tr>
-
+ <tr>
-    <th>
+   <tr> 
-      iOS
+    <td>
-    </th>
-
-    <th>
-      Android
-    </th>
-
-    <th>
       IE Mobile
-    </th>
-
-  </tr>
-
-  <tr>
-
-    <td>
-      latest
     </td>
-
-    <td>
-      latest
-    </td>
-
-    <td>
-      2 most recent major versions
-    </td>
-
     <td>
       11
     </td>
-
+  </tr>
+ <tr>
     <td>
-      2 most recent major versions
+      Safari
     </td>
 
     <td>
       2 most recent major versions
     </td>
-
-    <td>
-      Nougat (7.0)<br>Marshmallow (6.0)
-    </td>
-
-    <td>
-      11
-    </td>
-
   </tr>
-
   <tr>
-
     <td>
-
+      iOS
     </td>
 
     <td>
-
+      2 most recent major versions
     </td>
-
-    <td>
-
-    </td>
-
-    <td>
-      10
-    </td>
-
-    <td>
-
-    </td>
-
-    <td>
-
-    </td>
-
-    <td>
-      Lollipop<br>(5.0, 5.1)
-    </td>
-
-    <td>
-
-    </td>
-
   </tr> 
-
   <tr>
-
     <td>
-
+      Android
     </td>
 
     <td>
-
+      Nougat (7.0)<br>Marshmallow (6.0)<br>Lollipop (5.0, 5.1)<br>KitKat (4.4)
     </td>
-
-    <td>
-
-    </td>
-
-    <td>
-      9
-    </td>
-
-    <td>
-
-    </td>
-
-    <td>
-
-    </td>
-
-    <td>
-      KitKat<br>(4.4)
-    </td>
-
-    <td>
-
-    </td>
-
   </tr> 
 
 </table>
@@ -184,12 +129,11 @@ This file incorporates the mandatory and many of the optional polyfills as JavaS
 
 The npm packages for the _mandatory_ polyfills (such as `zone.js`) were installed automatically for you when you created your project and their corresponding `import` statements are ready to go. You probably won't touch these.
 
-But if you need an optional polyfill, you'll have to install its npm package with `npm` or `yarn`.
+But if you need an optional polyfill, you'll have to install its npm package.
-For example, [if you need the web animations polyfill](http://caniuse.com/#feat=web-animation), you could install it with either of the following commands:
+For example, [if you need the web animations polyfill](http://caniuse.com/#feat=web-animation), you could install it with `npm`, using the following command (or the `yarn` equivalent):
 
 <code-example language="sh" class="code-shell">
   npm install --save web-animations-js
-  yarn add web-animations-js
 </code-example>
 
 Then open the `polyfills.ts` file and un-comment the corresponding `import` statement as in the following example:
@@ -240,7 +184,9 @@ These are the polyfills required to run an Angular application on each supported
     </td>
 
     <td>
+
       [ES7/reflect](guide/browser-support#core-es7-reflect) (JIT only)
+
     </td>
 
   </tr>
@@ -252,7 +198,9 @@ These are the polyfills required to run an Angular application on each supported
     </td>
 
     <td>
+
       [ES6](guide/browser-support#core-es6)
+
     </td>
 
   </tr>
@@ -264,7 +212,9 @@ These are the polyfills required to run an Angular application on each supported
     </td>
 
     <td>
+
       [ES6<br>classList](guide/browser-support#classlist)
+
     </td>
 
   </tr>
@@ -302,12 +252,16 @@ Here are the features which may require additional polyfills:
   <tr style="vertical-align: top">
 
     <td>
+
       [JIT compilation](guide/aot-compiler).
+
       Required to reflect for metadata.
     </td>
 
     <td>
+
       [ES7/reflect](guide/browser-support#core-es7-reflect)
+
     </td>
 
     <td>
@@ -320,11 +274,15 @@ Here are the features which may require additional polyfills:
   <tr style="vertical-align: top">
 
     <td>
+
       [Animations](guide/animations)
+
     </td>
 
     <td>
+
       [Web Animations](guide/browser-support#web-animations)
+
     </td>
 
     <td>
@@ -336,11 +294,24 @@ Here are the features which may require additional polyfills:
   <tr style="vertical-align: top">
 
     <td>
-    If you use the following deprecated i18n pipes: [date](api/common/DeprecatedDatePipe), [currency](api/common/DeprecatedCurrencyPipe), [decimal](api/common/DeprecatedDecimalPipe) and [percent](api/common/DeprecatedPercentPipe)
+
+    If you use the following deprecated i18n pipes:
+    
+
+     [date](api/common/DeprecatedDatePipe), 
+     
+     [currency](api/common/DeprecatedCurrencyPipe),
+     
+     [decimal](api/common/DeprecatedDecimalPipe), 
+     
+     [percent](api/common/DeprecatedPercentPipe)
+
     </td>
 
     <td>
+
       [Intl API](guide/browser-support#intl)
+
     </td>
 
     <td>
@@ -352,11 +323,16 @@ Here are the features which may require additional polyfills:
   <tr style="vertical-align: top">
 
     <td>
-       [NgClass](api/common/NgClass) on SVG elements
+
+       [NgClass](api/common/NgClass) 
+       
+       on SVG elements
     </td>
 
     <td>
+
       [classList](guide/browser-support#classlist)
+
     </td>
 
     <td>
@@ -368,13 +344,20 @@ Here are the features which may require additional polyfills:
   <tr style="vertical-align: top">
 
     <td>
-      [Http](guide/http) when sending and receiving binary data
+
+      [Http](guide/http) 
+      
+      when sending and receiving binary data
     </td>
 
     <td>
+
       [Typed&nbsp;Array](guide/browser-support#typedarray)<br>
+
       [Blob](guide/browser-support#blob)<br>
+
       [FormData](guide/browser-support#formdata)
+
     </td>
 
     <td>
@@ -412,7 +395,9 @@ Below are the polyfills which are used to test the framework itself. They are a
   <tr>
 
     <td>
+
       <a id='core-es7-reflect' href="https://github.com/zloirock/core-js/blob/master/es7/reflect.js">ES7/reflect</a>
+
     </td>
 
     <td>
@@ -428,7 +413,9 @@ Below are the polyfills which are used to test the framework itself. They are a
   <tr>
 
     <td>
+
       <a id='core-es6' href="https://github.com/zloirock/core-js">ES6</a>
+
     </td>
 
     <td>
@@ -444,7 +431,9 @@ Below are the polyfills which are used to test the framework itself. They are a
   <tr>
 
     <td>
+
       <a id='classlist' href="https://github.com/eligrey/classList.js">classList</a>
+
     </td>
 
     <td>
@@ -460,7 +449,9 @@ Below are the polyfills which are used to test the framework itself. They are a
   <tr>
 
     <td>
+
       <a id='intl' href="https://github.com/andyearnshaw/Intl.js">Intl</a>
+
     </td>
 
     <td>
@@ -476,7 +467,9 @@ Below are the polyfills which are used to test the framework itself. They are a
   <tr>
 
     <td>
+
        <a id='web-animations' href="https://github.com/web-animations/web-animations-js">Web Animations</a>
+
     </td>
 
     <td>
@@ -492,7 +485,9 @@ Below are the polyfills which are used to test the framework itself. They are a
   <tr>
 
     <td>
+
       <a id='typedarray' href="https://github.com/inexorabletash/polyfill/blob/master/typedarray.js">Typed Array</a>
+
     </td>
 
     <td>
@@ -508,7 +503,9 @@ Below are the polyfills which are used to test the framework itself. They are a
   <tr>
 
     <td>
+
        <a id='blob' href="https://github.com/eligrey/Blob.js">Blob</a>
+
     </td>
 
     <td>
@@ -524,7 +521,9 @@ Below are the polyfills which are used to test the framework itself. They are a
   <tr>
 
     <td>
+
        <a id='formdata' href="https://github.com/francois2metz/html5-formdata">FormData</a>
+
     </td>
 
     <td>
@@ -546,7 +545,7 @@ computed with the <a href="http://closure-compiler.appspot.com/home">closure com
 {@a non-cli}
 ## Polyfills for non-CLI users
 
-If you aren't using the CLI, you should add your polyfill scripts directly to the host web page (`index.html`), perhaps like this.
+If you are not using the CLI, you should add your polyfill scripts directly to the host web page (`index.html`), perhaps like this.
 
 <code-example title="src/index.html">
   &lt;!-- pre-zone polyfills -->