Document uses plugins

Overview

Plugins harm SEO in two ways:

1. Search engines can't index plugin content. Plugin content won't show up in search results.
2. Many mobile devices don't support plugins, which creates frustrating experiences for mobile users This is likely to increase your bounce rate and other signals that indicate to search engines that the page is not helpful for mobile users.

Source:

• Unplayable content

Recommendations

Remove the plugins and convert your content to HTML.

See Video to learn the best practices for displaying video on the web.

More information

Lighthouse checks the page for tags that commonly represent plugins:

• embed
• object
• applet

And then flags each tag as a plugin if its MIME type matches any of the following:

• application/x-java-applet
• application/x-java-bean
• application/x-shockwave-flash
• application/x-silverlight
• application/x-silverlight-2

Or if the tag points to a URL with a file format that is known to represent plugin content:

• swf
• flv
• class
• xap

Audit source

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