added implementation chapter

presentation.md

@@ -91,6 +91,62 @@
 
 -> # Implementation
 
+- Goals:
+  - be as compatible with zepto as possible
+  - do not implement features that are inherently not designed for the web
+
+---
+
+-> # Implementation
+
+-> ## Toolchain
+
+- GHCJS (GHC compiler with JavaScript backend)
+- Grunt for task automation
+
+---
+
+-> # Implementation
+
+-> ## \<script\>
+
+- enable development experience similar to JavaScript
+- also enables loading of assets and external files
+- deprecates the zepto `load` keyword
+
+---
+
+-> # Implementation
+
+-> ## FFI
+
+- enable working with JavaScript bi-directionally
+- simple string-based FFI
+  - abstraction libraries allow for parsing of results e.g. with JSON
+- zepto side through GHCJS quasi-quoting
+- JavaScript side through calls to the zepto interpreter object
+
+---
+
+-> # Implementation
+
+-> ## DOM
+
+- Through the FFI DOM calls were possible
+- available through a third-party module
+
+---
+
+-> # Implementation
+
+-> ## Omissions
+
+- language definitions
+  - absence of files does not allow for `load`
+- later versions of zepto
+  - GHC intrinsics to load C and Haskell libraries during runtime
+  - compiled code not (yet) executable in browser
+
 ---
 
 -> # Evaluation of the Prototype