docs: Clarify that checker can be used for CSS/SVG

README.md

@@ -105,11 +105,11 @@ can invoke the checker with just `vnu`.
 
 To check one or more documents from the command line:
 
-      vnu-runtime-image/bin/vnu      FILE.html FILE2.html FILE3.HTML...
+      vnu-runtime-image/bin/vnu      FILE.html FILE2.html FILE3.html...
 
-      vnu-runtime-image\bin\vnu.bat  FILE.html FILE2.html FILE3.HTML...
+      vnu-runtime-image\bin\vnu.bat  FILE.html FILE2.html FILE3.html...
 
-      java -jar ~/vnu.jar            FILE.html FILE2.html FILE3.HTML...
+      java -jar ~/vnu.jar            FILE.html FILE2.html FILE3.html...
 
 **Note:** If you get a `StackOverflowError` error when invoking the checker, try
 adjusting the thread stack size by providing the `-Xss` option to java:
@@ -340,8 +340,8 @@ provides the following options:
 The Nu Html Checker — along with being usable as [a standalone command-line
 client][26] — can be run as an HTTP service, similar to [checker.html5.org][27],
 [html5.validator.nu][28], and [validator.w3.org/nu][29], for browser-based
-checking of HTML documents over the Web. To that end, the checker is released as
-several separate packages:
+checking of HTML documents, CSS stylesheets, and SVG images over the Web. To
+that end, the checker is released as several separate packages:
 
    [26]: https://validator.github.io/validator/#usage
    [27]: https://checker.html5.org/
@@ -356,12 +356,12 @@ several separate packages:
 
   * `vnu.war` for deploying the checker to a servlet container such as Tomcat
 
-All deployments expose a REST API that enables checking of HTML documents from
-other clients, not just web browsers. And the Linux, Windows, and macOS binaries
-and `vnu.jar` package also include a simple HTTP client that enables you to
-either send documents to a locally-running instance of the checker HTTP service
-— for fast command-line checking — or to any remote instance of the checker HTTP
-service running anywhere on the Web.
+All deployments expose a REST API that enables checking of HTML documents, CSS
+stylesheets, and SVG images from other clients, not just web browsers. And the
+Linux, Windows, and macOS binaries and `vnu.jar` package also include a simple
+HTTP client that enables you to either send documents to a locally-running
+instance of the checker HTTP service — for fast command-line checking — or to
+any remote instance of the checker HTTP service running anywhere on the Web.
 
 The [latest releases of the Linux, Windows, and macOS binaries and vnu.jar and
 vnu.war packages][30] are available from the `validator` project at github. The
@@ -412,7 +412,8 @@ different address:
 When you open [http://0.0.0.0:8888][32] (or whatever URL corresponds to the
 `nu.validator.servlet.bind-address` value you’re using), you’ll see a form
 similar to [validator.w3.org/nu][33] that allows you to enter the URL of an HTML
-document and have the results for that document displayed in the browser.
+document, CSS stylesheet, or SVG image, and have the results of checking that
+resource displayed in the browser.
 
    [32]: http://0.0.0.0:8888
    [33]: https://validator.w3.org/nu/

index.html

@@ -260,13 +260,13 @@ <h2>Usage</h2>
 
 <p>To check one or more documents from the command line:
 <pre>
-  vnu-runtime-image/bin/vnu      FILE.html FILE2.html FILE3.HTML...
+  vnu-runtime-image/bin/vnu      FILE.html FILE2.html FILE3.html...
 </pre>
 <pre>
-  vnu-runtime-image\bin\vnu.bat  FILE.html FILE2.html FILE3.HTML...
+  vnu-runtime-image\bin\vnu.bat  FILE.html FILE2.html FILE3.html...
 </pre>
 <pre>
-  java -jar ~/vnu.jar            FILE.html FILE2.html FILE3.HTML...
+  java -jar ~/vnu.jar            FILE.html FILE2.html FILE3.html...
 </pre>
 
 <div class=note>
@@ -547,8 +547,8 @@ <h2 id="web-based-checking">Web-based checking</h2>
   <a href="https://html5.validator.nu/">html5.validator.nu</a>,
   and
   <a href="https://validator.w3.org/nu/">validator.w3.org/nu</a>,
-  for browser-based checking of HTML documents over
-  the Web.
+  for browser-based checking of HTML documents, CSS stylesheets, and SVG
+  images over the Web.
   To that end, the checker is released as several separate packages:
   <ul>
   <li>Linux, Windows, and macOS binaries for
@@ -560,8 +560,8 @@ <h2 id="web-based-checking">Web-based checking</h2>
   </ul>
   <p>
   All deployments expose a REST API that enables checking of HTML
-  documents from other clients, not just web browsers. And the
-  Linux, Windows, and macOS binaries and
+  documents, CSS stylesheets, and SVG images from other clients, not just
+  web browsers. And the Linux, Windows, and macOS binaries and
   <code>vnu.jar</code> package also include
   <a href="#http-client">a simple HTTP client</a> that enables you to
   either send documents to a locally-running instance of the checker HTTP
@@ -640,8 +640,8 @@ <h3>Standalone web server</h3>
     <code>nu.validator.servlet.bind-address</code> value you’re using),
     you’ll see a form similar to <a
     href="https://validator.w3.org/nu/">validator.w3.org/nu</a> that allows
-    you to enter the URL of an HTML document and have the results for that
-    document displayed in the browser.
+    you to enter the URL of an HTML document, CSS stylesheet, or SVG image,
+    and have the results of checking that resource displayed in the browser.
 
 <div class=note>
 <p><b>Note:</b> If you get a <code>StackOverflowError</code>