css: selector notes

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+# css
+
+## selector
+
+`.moose` element with class
+```html
+<div class = "moose"></div>  // selected
+<div class = "bar"></div>    // NOT selected
+```
+
+`.moose.bar` element with multiple classes
+```html
+<div class = "moose bar"></div>  // selected
+<div class = "bar"></div>        // NOT selected
+```
+
+`.moose .bar` descendant element with classes
+```html
+<div class = "moose">
+    <div class = "bar"></div>  // selected
+</div>
+<div class = "bar"></div>      // NOT selected
+```
+
+`p` specific element
+```html
+<p></p>      // selected
+<div></div>  // NOT selected
+```
+
+`p.bar` specific element with class
+```html
+<p class = "bar"></p>  // selected
+<p class = "foo"></p>  // NOT selected
+```
+
+`p,div` any element
+```html
+<p></p>      // selected
+<div></div>  // selected
+<a></a>      // NOT selected
+```
+
+`div p` descendant element of other element
+```html
+<div><p></p></div>           // selected
+<div><ul><p></p></ul></div>  // NOT selected
+```
+
+`div > o` direct descendant element of other element
+```html
+<div><p></p></div>           // selected
+<div><ul><p></p></ul></div>  // NOT selected
+```