third_party/blink/renderer/core/feature_policy/document_policy_features.json5

{
  // All document policy (https://w3c.github.io/webappsec-feature-policy/document-policy.html)
  // features are defined here.
  // All Features have to be defined in FeaturePolicyFeature enum as well
  // (defined in third_party/blink/public/mojom/feature_policy/feature_policy.mojom).
  // The enum value has to have the same name as the feature name here.

  parameters: {
    // document_policy_name: "FEATURE_NAME" is used to specify the policy name
    // which gets parsed from the header or the policy attribute.
    document_policy_name: {},
    // value type allowed in mojom::PolicyValueType which is defined in
    // third_party/blink/public/mojom/feature_policy/policy_value.mojom.
    value_type: {},
    // valid c++ expression strings, e.g. true/false, 1.0, -1.
    // or use reserved keyword 'min'/'max'.
    default_value: {},
    // "depends_on" specifies relationship to runtime features defined
    // in "runtime_enabled_features.json5":
    // depends_on: ["feature1", "feature2", ...]
    // * If the depends_on features are *only* runtime features, the feature is
    //   available if any of the runtime features are enabled.
    // * If the depends_on list includes origin trial features, the feature is
    //   available if any of the origin trial features are enabled.
    depends_on: {
      default: [],
      valid_type: "list",
    },
  },

  data: [
    {
      name: "Default",
      document_policy_name: "*",
      value_type: "Bool",
      default_value: "true",
      depends_on: []
    },
    {
      name: "FontDisplay",
      document_policy_name: "font-display-late-swap",
      value_type: "Bool",
      default_value: "true",
      depends_on: ["ExperimentalPolicies"],
    },
    {
      name: "LosslessImagesMaxBpp",
      document_policy_name: "lossless-images-max-bpp",
      value_type: "DecDouble",
      default_value: "max",
      depends_on: ["ExperimentalPolicies"],
    },
    {
      // The ForceLoadAtTop policy lets pages opt-out of scrolling that
      // automatically happens on page load. This includes fragment scrolls,
      // text fragment scrolls (i.e. this provides an opt-out for the Scroll To
      // Text feature), and scroll restoration.
      name: "ForceLoadAtTop",
      document_policy_name: "force-load-at-top",
      value_type: "Bool",
      default_value: "false",
    },
    {
      name: "LosslessImagesStrictMaxBpp",
      document_policy_name: "lossless-images-strict-max-bpp",
      value_type: "DecDouble",
      default_value: "max",
      depends_on: ["ExperimentalPolicies"],
    },
    {
      name: "LossyImagesMaxBpp",
      document_policy_name: "lossy-images-max-bpp",
      value_type: "DecDouble",
      default_value: "max",
      depends_on: ["ExperimentalPolicies"],
    },
    {
      name: "OversizedImages",
      document_policy_name: "oversized-images",
      value_type: "DecDouble",
      default_value: "max",
      depends_on: ["ExperimentalPolicies"],
    },
    {
      name: "UnsizedMedia",
      document_policy_name: "unsized-media",
      value_type: "Bool",
      default_value: "true",
      depends_on: ["ExperimentalPolicies"],
    },
    {
      name: "LayoutAnimations",
      document_policy_name: "layout-animations",
      value_type: "Bool",
      default_value: "true",
      depends_on: ["ExperimentalPolicies"],
    },
    {
      name: "DocumentWrite",
      document_policy_name: "document-write",
      value_type: "Bool",
      default_value: "true",
      depends_on: ["ExperimentalPolicies"],
    },
    {
      name: "SyncScript",
      document_policy_name: "sync-script",
      value_type: "Bool",
      default_value: "true",
      depends_on: ["ExperimentalPolicies"],
    },
    {
      name: "JSProfiling",
      document_policy_name: "js-profiling",
      value_type: "Bool",
      default_value: "false",
      depends_on: ["ExperimentalJSProfiler"],
    },
    {
      name: "SyncXHR",
      document_policy_name: "sync-xhr",
      value_type: "Bool",
      default_value: "true",
      depends_on: ["DocumentPolicySyncXHR"],
    },
  ],
}