srowen commented on a change in pull request #25430: [SPARK-28540][WEBUI] 
Document Environment page
URL: https://github.com/apache/spark/pull/25430#discussion_r314323676
 
 

 ##########
 File path: docs/web-ui.md
 ##########
 @@ -49,6 +49,50 @@ sizes and using executors for all partitions in an RDD or 
DataFrame.
 The Environment tab displays the values for the different environment and 
configuration variables,
 including JVM, Spark, and system properties.
 
+<p style="text-align: center;">
+  <img src="img/webui-env-tab.png"
+       title="Env tab"
+       alt="Env tab"
+       width="100%" />
+  <!-- Images are downsized intentionally to improve quality on retina 
displays -->
+</p>
+
+We can see that this environment page has five parts, it is a useful place to 
check whether your properties have
+been set correctly. The first part 'Runtime Information' simply contains the
+[runtime properties](configuration.html#runtime-environment) like versions of 
Java and Scala.
+The second part 'Spark Properties' lists the [application 
properties](configuration.html#runtime-environment) like
+'spark.app.name' and 'spark.driver.memory'.
+
+<p style="text-align: center;">
+  <img src="img/webui-env-hadoop.png"
+       title="Hadoop Properties"
+       alt="Hadoop Properties"
+       width="100%" />
+  <!-- Images are downsized intentionally to improve quality on retina 
displays -->
+</p>
+Clicking the 'Hadoop Properties' link displays properties relative to Hadoop 
and Yarn. Note that properties like
 
 Review comment:
   Yarn -> YARN
   tick-quote `spark.hadoop.*`

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