Added a "notebook"

notes.md

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+# Notes
+
+## Overview
+---
+
+Aim of this document is to make notes of various things as I encounter them. Consider it learning from working through specific challenges or other exercises. Probably should be in a note app, or a wiki, or something, but for now they are here.
+
+Think of it as a combination of learning, and tips and tricks. They will start unorganised, and then should be put into some semblance of order; where that is possible. 
+
+## The Notes Themselves (unorganised)
+---
+
+* Now little difference between `<input type="submit">` and `<button>`. 
+  * It used to be the case that IE6 didn't properly support it, so your website would look broken.
+  * By default `<button>` implies `type="submit"`
+  * A `button` can have child elements, an `<input type="submit">` can't. (**verify**) 
+
+* When using `em` the increases are compound, so if you have a `p`, inside a `div`, inside `body`. The `body` font size is set in `px`. The `div` and `p` both set a font size using `em` to set a relative size, then that relative size would be
+    * in `div`: body font size * font size em
+    * in `p`: div relative font size * p's font size in em
+  * ```css
+    body {
+        font-size: 20px;
+    }
+
+    div {
+        font-size: 2em; /* font size is 40px */
+    }
+
+    p {
+        font-size: 2em; /* font size in this div is now 80px  */
+    }
+    ```
+
+* Random aside: can't carry on a list after putting a codeblock inside a list
+* Blah