Bring README in line with MathJax/README

README.md

@@ -51,7 +51,7 @@ If you are loading MathJax from a CDN into a web page, there is no
 need to install anything.  Simply use a `script` tag that loads
 MathJax from the CDN.  E.g.,
 
-```html
+``` html
 <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
 ```
 
@@ -62,44 +62,48 @@ and the [MathJax Component
 Repository](https://github.com/mathjax/MathJax-demos-web) for more information.
 
 
-
-
 ### Using MathJax Components in node applications
 
 To use MathJax components in a node application, install the `mathjax` package:
 
-    npm install mathjax@3
+``` bash
+npm install mathjax@3
+```
 
-(we are still making updates to version 2, so you should include `@3` since the latest chronological version may not be version 3).
+(we are still making updates to version 2, so you should include `@3`
+since the latest chronological version may not be version 3).
 
 Then require `mathjax` within your application:
 
-```js
+``` javascript
 require('mathjax').init({ ... }).then((MathJax) => { ... });
 ```
 
 where the first `{ ... }` is a MathJax configuration, and the second
 `{ ... }` is the code to run after MathJax has been loaded.  E.g.
 
-```js
+``` javascript
 require('mathjax').init({
-  loader: {
-    require: require,
-    paths: {mathjax: 'mathjax/es5'},
-    load: ['input/tex', 'output/svg']
-  }
+  loader: {load: ['input/tex', 'output/svg']}
 }).then((MathJax) => {
   const svg = MathJax.tex2svg('\\frac{1}{x^2-1}', {display: true});
   console.log(MathJax.startup.adaptor.outerHTML(svg));
 }).catch((err) => console.log(err.message));
 ```
 
+**Note:** this technique is for node-based application only, not for
+browser applications.  This method sets up an alternative DOM
+implementation, which you don't need in the browser, and tells MathJax
+to use node's `require()` command to load external modules.  This
+setup will not work properly in the browser, even if you webpack it or
+bundle it in other ways.
 
 See the
 [documentation](https//docs.mathjax.org/en/latest/index.html#server-nodejs)
 and the [MathJax Node
 Repository](https://github.com/mathjax/MathJax-demos-node) for more details.
 
+
 ### Using MathJax modules directly in node applications
 
 You can use the MathJax JavaScript files (as opposed to MathJax
@@ -124,7 +128,7 @@ demos](https://github.com/mathjax/MathJax-demos-node) for examples).
 
 If you want to work from the GitHub repository directly, then do the following:
 
-```bash
+``` bash
 git clone https://github.com/mathjax/MathJax-src.git mathjax-src
 cd mathjax-src
 npm run --silent compile

components/webpack.common.js

@@ -140,6 +140,7 @@ const PACKAGE = function (name, mathjax, libs, dir, dist) {
             path: distDir,
             filename: name + (dist === '.' ? '.min.js' : '.js')
         },
+        devtool: 'sourcemap',
         plugins: PLUGINS(mathjax, libs, dir),
         module: MODULE(dir),
         performance: {
@@ -150,8 +151,9 @@ const PACKAGE = function (name, mathjax, libs, dir, dist) {
                 uglifyOptions: {
                     output: {
                         ascii_only: true
-                    },
+                    }
                 },
+                sourceMap: true
             })]
         },
         mode: 'production'