No Issue - Drafted existing CSS coding style guide

css.md

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+# CSS
+
+- Philosophy
+  - Use [valid](https://jigsaw.w3.org/css-validator/) CSS where possible
+  - Try to avoid user agent detection and CSS "hacks"
+- File
+  - No mode line comments (`/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */`)
+  - All files should have a [license header](https://adblockplus.org/license-headers)
+- Naming
+  - No special CSS notation (EG: Hungarian, BEM, other prefixes or suffixes denoting type or scope)
+  - Use meaningful or generic ID and class names
+  - Use ID and class names that are as short as possible but as long as necessary
+  - Avoid qualifying ID and class names with type selectors (EG: div.error)
+  - Separate words in Id and class names by a hyphen
+  - Group sections together by comment
+- Spacing
+  - Use unix-style newlines
+  - Use spaces instead of tabs
+  - Use 2 spaces for indentation
+  - Use a space after a property name’s colon
+  - Opening braces always go on their own line.
+  - Separate rules by new lines
+  - Separate selectors and declarations by new lines
+  - Indent all block content (EG: Media queries)
+  - Line length is 80 char, except when it improves readability
+  - No trailing whitespace
+  - Newline at end of file
+- Properties
+  - Use double quotes
+  - Use hex colors
+    -  3 character notation  where possible
+    - Provide units where possible (EG: 0px vs 0)
+    - Don't omit loading 0s in decimal numbers (EG: 0.5px vs .5px)
+  - Shorthand properties are optional
+  - Use a semicolon after every declaration
+  - Property sort order
+    - Display
+    - Positioning
+    - Box model
+    - Colors and Typography
+    - Other
+- Comments
+  - Use JavaDoc style comments
+  - Don't comment code out, delete it.
+  - Don't add TODO comments, create an issue and reference it in a comment instead.