How do I properly escape quotes inside HTML attributes?

Question

I have a drop down on a web page which is breaking when the value string contains a quote.

The value is \"asd, but in the DOM it always appears as an em

Answer 1

Per HTML syntax, and even HTML5, the following are all valid options:

test
test
test
test
test
test
test

Note that if you are using XML syntax the quotes (single or double) are required.

Here's a jsfiddle showing all of the above working.