Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
plugin-types directive restricts the set of plugins that
can be embedded into a document by limiting the types of resources which can be loaded.
- the element to load does not declare a valid MIME type,
the declared type does not match one of specified types in the
- the fetched resource does not match the declared type.
To disallow all plugins, the
object-src directive should be set to
'none' which will disallow plugins. The
is only used if you are allowing plugins with
object-src at all.
<meta http-equiv="Content-Security-Policy" content="object-src 'none'" />
Not part of any current specification. Used to be defined in CSP 2.
BCD tables only load in the browser