[Bug 27511] [Shadow DOM] Editorial Fix.
custom element semantics
added link
added text to code example
chnaged example name to taco-button
filling out example
filled out the examples
code style
added code style
added pretty code css

added note about event handlers
Merge pull request #26 from stevefaulkner/gh-pages

added guts of custom elements semantics section
fixed code examples

fixes https://www.w3.org/Bugs/Public/show_bug.cgi?id=27545 and
https://www.w3.org/Bugs/Public/show_bug.cgi?id=27546
Merge pull request #27 from stevefaulkner/gh-pages

fixed code examples
Bug 27550 - [imports]: Content-Disposition header should be recognized

Add Content-Disposition handling to the fetch algorithm.