Expect-CT

Read More at MDN DocsView Spec

Safe to Use

Expect-CT is not safe to use.

It’s supported by 69% of global browsers.

Browsers

ChromeSep 5, 2017v61.0.0
26%╱99%
There are no users of Chrome running a supported version.
SafariUnsupported
Safari does not support this feature.
EdgeJan 15, 2020v79.0.0
5%╱100%
There are no users of Edge running a supported version.
FirefoxUnsupported
Firefox does not support this feature.

Version Breakdown

 
Agent
Support
Adoption
Chrome
Sep 5, 2017 v61.0.0
26%╱99%
There are no users of Chrome running a supported version.
Sep 5, 2017 – Latest
v61.0.0+
26%╱99%

Full Support

Before later builds of Chrome 64, invalid Expect-CT reports would be sent. Newer versions do not send reports after 10 weeks from the build date. See bug 786563.

Chrome Android
Sep 5, 2017 v61.0.0
36%╱100%
100% of Chrome Android users are running a supported version.
Sep 5, 2017 – Latest
v61.0.0+
36%╱100%

Full Support

Before later builds of Chrome 64, invalid Expect-CT reports would be sent. Newer versions do not send reports after 10 weeks from the build date. See bug 786563.

Edge
Jan 15, 2020 v79.0.0
5%╱100%
There are no users of Edge running a supported version.
Jan 15, 2020 – Latest
v79.0.0+
5%╱100%

Full Support

Firefox
Unsupported
Firefox does not support this feature.

No Support

Firefox for Android
Unsupported
Firefox for Android does not support this feature.

No Support

Internet Explorer
Unsupported
Internet Explorer does not support this feature.

No Support

 
Quest Browser
Unknown v5.0.0
Quest Browser supports this feature.
Unknown
v5.0.0+

Full Support

Before later builds of Chrome 64, invalid Expect-CT reports would be sent. Newer versions do not send reports after 10 weeks from the build date. See bug 786563.

Opera
Sep 27, 2017 v48.0.0
1%╱98%
There are no users of Opera running a supported version.
Sep 27, 2017 – Latest
v48.0.0+
1%╱98%

Full Support

Opera Android
Feb 15, 2018 v45.0.0
Opera Android supports this feature.
Feb 15, 2018 – Latest
v45.0.0+

Full Support

Before later builds of Opera 47, invalid Expect-CT reports would be sent. Newer versions do not send reports after 10 weeks from the build date. See bug 786563.

Safari
Unsupported
Safari does not support this feature.

No Support

Safari on iOS
Unsupported
Safari on iOS does not support this feature.

No Support

Samsung Internet
Jul 18, 2018 v8.0.0
2%╱93%
There are no users of Samsung Internet running a supported version.
Jul 18, 2018 – Latest
v8.0.0+
2%╱93%

Full Support

Before later builds of Samsung Internet 9.0, invalid Expect-CT reports would be sent. Newer versions do not send reports after 10 weeks from the build date. See bug 786563.

WebView Android
Unsupported
WebView Android does not support this feature.

No Support

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