A number of antivirus companies have assessed Alexa's toolbar. The toolbar for Internet Explorer 7 was at one point flagged as malware by Microsoft Defender.Symantec classifies the toolbar as "trackware", while McAfee classifies it as adware, deeming it a "potentially unwanted program."McAfee Site Advisor rates the Alexa site as "green", finding "no significant problems" but warning of a "small fraction of downloads ... that some people consider adware or other potentially unwanted programs." Though it is possible to delete a paid subscription within an Alexa account, it is not possible to delete an account that is created at Alexa through any web interface, though any user may contact the company via its support webpage.
Certified statistics
Using the Alexa Pro service, website owners can sign up for "certified statistics", which allows Alexa more access to a site's traffic data. Site owners input Javascript code on each page of their website that, if permitted by the user's security and privacy settings, runs and sends traffic data to Alexa, allowing Alexa to display—or not display, depending on the owner's preference—more accurate statistics such as total pageviews and unique pageviews.
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Embed HTML
Many sites and online services, like Google Maps, suggest HTML code (usually iframes) to embed widgets and content on your page.
You can add such HTML widgets in your quizzes.
Please note:
In case pasted code is not just iframe tag it will be wrapped into HTTPS iframe.
Only HTTPS sources for iframes, styles and javascript links are supported.
Non-HTTPS sources will be blocked by the browser and won't behave properly.