elm-ui/CSS-LOOKUP.md

CSS Concepts and where to find them

This library creates a new language around layout and style, though if you're already used to CSS, you're probably wondering where certain concepts lie.

I know how I can do it in CSS, but how could I approach the problem using Style Elements?

CSS	Style Elements	Description
position:absolute	above, below, onRight, onLeft, inFront, behindContent	In Style Elements we can attach elements relative to another element. They won't affect normal flow, just like position:absolute
position:fixed	inFront if it's attached to the Element.layout element.	position:fixed needs to be at the top of your view or else it can break in seemingly random ways. Did you know position:fixed will position something relative to the viewport OR any parent that uses filter, transform or perspective? So you add a blur effect and your layout breaks...
z-index	N/A	One of the goals of the library was to make z-index a behind-the-scenes detail. If you ever encounter a situation where you feel like you actually need it, let me know on slack or through the issues.
float:left float:right	alignLeft or alignRight when inside a paragraph or a textColumn
opacity	alpha
margin	N/A Instead, check out padding and spacing	margin in CSS was designed to fight with padding. This library was designed to minimize override logic and properties that fight with each other in order to create a layout language that is predictable and easy to think about. The result is that in style elements, there's generally only one place where an effect can happen.
:hover, :focus, :active	mouseOver, focused, mouseDown	Only certain styles are allowed to be in a pseudo state. They have the type Attr decorative msg, which means they can be either an Attribute or a Decoration.
<form>	N/a	Elm already has a mechanism for submiting data to a server, namely the Http package. There has been some mention that the form element might be beneficial accessibility-wise, which I'm definitely open to hearing about!
onSubmit	N/A	Similar to <form>, there is no onSubmit behavior. Likely if you're attempting to capture some of the keybaord related behavior of onSubmit, you're likely better just crafting a keyboard even handler in the first place!