Feature Policy Guide
How to Test a New Feature with Feature Policy
This directory contains a framework to test features with feature policy.
When adding a new feature to feature policy, the following cases should be tested:
- feature enabled by header policy [HTTP tests]
- test when feature is enabled by feature policy HTTP header;
- feature disabled by header policy [HTTP tests]
- test when feature is disabled by feature policy HTTP header;
- feature enabled on self origin by header policy [HTTP tests]
- test when feature is enabled only on self origin by feature policy HTTP header.
- feature allowed by container policy (iframe "allow" attribute);
- test when feature is enabled by iframe "allow" attribute on self and cross origins.
- feature allowed by container policy, redirect on load.
- test when feature is enabled by iframe "allow" attribute when the iframe is being redirected to a new origin upon loading
How to Use the Test Framework
Use test_feature_availability() defined in
/feature-policy/resources/featurepolicy.js. Please refer to the comments
in /feature-policy/resources/featurepolicy.js for how this function works.
How to Write Header Policy Tests
HTTP tests are used to test features with header policy.
-
Define the header policy in
<feature-name>-<enabled | disabled | enabled-on-self-origin>-by-feature-policy.https.sub.html.headers. Example:Feature-Policy: feature-name *
-
In
<feature-name>-<enabled | disabled | enabled-on-self-origin>-by-feature-policy.https.sub.html: -
test if feature is enabled / disabled in the main frame;
-
test if feature is enabled / disabled in a same-origin iframe;
-
test if feature is enabled / disabled in a cross-origin iframe.
Examples:
/feature-policy/payment-disabled-by-feature-policy.https.sub.html
/feature-policy/payment-disabled-by-feature-policy.https.sub.html.headers
How to Write Container Policy Tests
Simply use test_feature_availability() with the optional argument
feature_name specified to test if:
- feature is enabled / disabled in a same-origin iframe;
- feature is enabled / disabled in a cross-origin iframe.
Example:
/feature-policy/payment-allowed-by-feature-policy-attribute.https.sub.html
How to Write Container Policy Tests with Redirect
Similar to the section above, append
/feature-policy/resources/redirect-on-load.html# to the argument src
passed to test_feature_availability().
Example:
/feature-policy/payment-allowed-by-feature-policy-attribute-redirect-on-load.https.sub.html