I get inconsistent results when I triple-click to create the selection. For example, triple-clicking the word "Start" in the first paragraph highlights the entire first line, extending to the right margin; hitting enter to "mark" it results in the entire paragraph being marked. Triple-clicking the first word "Marklib" in the next sentence highlights the remaining three sentences, but only "Marklib" is marked.

Also, any marking in the "code block" or the page title omits the spaces, which looks a little awkward.

Running Chrome 43.0.2357.124 on OS X