Did you ever see this triangle (at the right bottom of the lock) on a website? Especially on your own website you don't want to see this. It means that your website is not exactly secure. I came across that when I tried to get a video working in one website (more about that in another article). I goot rid of it by changing two links of graphics of a website of the European Union (starting with http://..... I guess I had those links already for ages there. They actually have updated those links to secure links now (starting with https://....).