Generally, it is caused by the following situations:

  • img, iframe, and frame with src attribute which is blank or non found items.
  • any request from non-secure (non https) source.
  • any usage of ‘about:’ such as about:blank

Trouble shooting:

  • examine any src attribute of img, iframe and frame carefully

Solution:

  • change src attribute to ‘javascript:false;’ or a ‘blank.html’

Browsers which have this issue:

  • IE 6 and below

Read more from here.

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