Is there a plugin, macro, or other technique that will let me highlight a chunk of code and replace the < with < and > with >? Right now, I'm doing a search and replace in Sublime text and pasting the result. I didn't see a Find and Replace in Selection in DW.
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Copy code and paste into DW Design view. The resulting code will contain the HTML entities you want.
Another option is to use CodePen or JS Fiddle to embed code directly into your blog post. See CSS Tricks for an example.