When browsing to a secure site, you can get a warning about insecure content being shown. In Chrome, this is indicated by a padlock with a yellow triangle. When clicking this icon, you get information about the certificate being used, with this warning message: (in this example for gmail)
Your connection to mail.google.com is encrypted with 128-bit encryption. However, this page includes other resources which are not secure. These resources can be viewed by others while in transit and can be modified by an attacker to change the look of the page.
To know what content is secure or insecure on a website, you can install the free Google Chrome extension "Secure or not".
On the right side of the Chrome address bar, a button is added containing a padlock with a question mark. When pressing the button, all secure content is surrounded with a green dashed line, and all insecure content with a red dashed line.
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