Feature Description

Currently the Sandboxing experiment is limited to Standard mode. This is because pages using the experiment are not valid AMP, meaning they will not get indexed. Nevertheless, invalid paired AMP pages are still useful for one important case: a mobile-optimized version of the site. When mobile redirection is enabled in particular, being able to serve pages using the AMP runtime and our optimizations (e.g. Reader theme) will enable the plugin to be usable as a "mobile theme" plugin.

• Show the Sandboxing experiment panel when any template mode is selected on the Settings screen, not just when the Standard mode is selected.
• When a non-strict sandboxing level is selected, never output the link[rel=amphtml] element but always output link[rel=alternate] which is output when mobile redirection is enabled. The reason here is that we do not want to advertise to Googlebot in this case that there is an AMP page because then it will complain if there are validation errors.
• Prevent redirecting from AMP to non-AMP when in a paired mode if the Sandboxing level is not set to Strict (and there is kept invalid markup).
• Show link to exit mobile version on AMP pages even when mobile redirection is not enabled  #5293

Acceptance Criteria

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Implementation Brief

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QA Testing Instructions

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Demo

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Changelog Entry

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