A triple-click in the left margin (when the mouse pointer is an up-and-to-the-right arrow) selects the entire document.
A triple-click in the left margin (when the mouse pointer is an up-and-to-the-right arrow) selects the entire document.
A triple-click in the left margin (when the mouse pointer is an up-and-to-the-right arrow) selects the entire document.
A quadruple-click will select all text within a single paragraph while keeping the aforementioned popup open.
In Google Chrome (and by extension ChromeOS), triple-clicking any part of a Web page will cause the nearest text node to be highlighted completely.