I’ve got the speech bubble finished, but I don’t know how to position the blue dot exactly 50% of the height of the speech bubble (**the speech bubble can vary in height**) and 10px to the left of it. It must be positioned absolutely so that the blue dot can be placed anywhere on the page.
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Ah OK. Just stack the pseudo elements :before and :after where the first arrow has a dark border color and the other one has a light border color covering on the dark arrow to create fake diagonal border effect. Extra markup for the circle:
border-width:9px; /* the second border should be smaller than the first one to show the dark border color below */
border-left-color:gold; /* same with background color */