diff --git a/files/en-us/web/http/headers/content-security-policy/base-uri/index.md b/files/en-us/web/http/headers/content-security-policy/base-uri/index.md
index fbd3191794f188f..bdd7abd71b6eca8 100644
--- a/files/en-us/web/http/headers/content-security-policy/base-uri/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/base-uri/index.md
@@ -33,16 +33,19 @@ Content-Security-Policy: base-uri 'none';
 Content-Security-Policy: base-uri <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no base URI may be set using a `<base>` element
-- a list of _source expression_ values, meaning that a `<base>` element may set a base URI if it matches any of the given source expressions.
+- `'none'`
+  - : No base URI may be set using a `<base>` element. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources). However, only the following subset of those values apply to `base-uri`:
+  - : A space-separated list of _source expression_ values. A `<base>` element may set a base URI if its value matches any of the given source expressions.
 
-- `<host-source>`
-- `<scheme-source>`
-- the keyword value `'self'`.
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources). However, only the following subset of those values apply to `base-uri`:
+
+    - `<host-source>`
+    - `<scheme-source>`
+    - the keyword value `'self'`.
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/child-src/index.md b/files/en-us/web/http/headers/content-security-policy/child-src/index.md
index 564e58cc5b88b34..ac046bad98a8146 100644
--- a/files/en-us/web/http/headers/content-security-policy/child-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/child-src/index.md
@@ -40,12 +40,15 @@ Content-Security-Policy: child-src 'none';
 Content-Security-Policy: child-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/connect-src/index.md b/files/en-us/web/http/headers/content-security-policy/connect-src/index.md
index 26cc96d0a2c5af7..04d2a0408038dc5 100644
--- a/files/en-us/web/http/headers/content-security-policy/connect-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/connect-src/index.md
@@ -9,14 +9,14 @@ browser-compat: http.headers.Content-Security-Policy.connect-src
 
 The HTTP {{HTTPHeader("Content-Security-Policy")}} (CSP)
 **`connect-src`** directive restricts the URLs which can be
-loaded using script interfaces. The APIs that are restricted are:
+loaded using script interfaces. The following APIs are controlled by this directive:
 
-- {{HTMLElement("a")}} [`ping`](/en-US/docs/Web/HTML/Element/a#ping),
-- {{domxref("Window/fetch", "fetch()")}},
-- {{domxref("XMLHttpRequest")}},
-- {{domxref("WebSocket")}},
-- {{domxref("EventSource")}}, and
-- {{domxref("Navigator.sendBeacon()")}}.
+- The [`ping`](/en-US/docs/Web/HTML/Element/a#ping) attribute in {{htmlelement("a")}} elements
+- {{domxref("Window/fetch", "fetch()")}}
+- {{domxref("XMLHttpRequest")}}
+- {{domxref("WebSocket")}}
+- {{domxref("EventSource")}}
+- {{domxref("Navigator.sendBeacon()")}}
 
 > **Note:** `connect-src 'self'` does not resolve to websocket
 > schemes in all browsers, more info in this [issue](https://github.com/w3c/webappsec-csp/issues/7).
@@ -48,12 +48,15 @@ Content-Security-Policy: connect-src 'none';
 Content-Security-Policy: connect-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
+
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/default-src/index.md b/files/en-us/web/http/headers/content-security-policy/default-src/index.md
index e5a55b5107e20af..89e20088b45c002 100644
--- a/files/en-us/web/http/headers/content-security-policy/default-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/default-src/index.md
@@ -46,12 +46,15 @@ Content-Security-Policy: default-src 'none';
 Content-Security-Policy: default-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/font-src/index.md b/files/en-us/web/http/headers/content-security-policy/font-src/index.md
index a862bc65d41d850..f9e3a4204578ef0 100644
--- a/files/en-us/web/http/headers/content-security-policy/font-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/font-src/index.md
@@ -38,12 +38,15 @@ Content-Security-Policy: font-src 'none';
 Content-Security-Policy: font-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/form-action/index.md b/files/en-us/web/http/headers/content-security-policy/form-action/index.md
index e8a86e67f33a63f..46fd83f56328f9b 100644
--- a/files/en-us/web/http/headers/content-security-policy/form-action/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/form-action/index.md
@@ -36,16 +36,19 @@ Content-Security-Policy: form-action 'none';
 Content-Security-Policy: form-action <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no form submissions may be made
-- a list of _source expression_ values, meaning that form submissions may be made to URLs that match any of the given source expressions.
+- `'none'`
+  - : No form submissions may be made. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources). However, only the following subset of those values apply to `form-action`:
+  - : A space-separated list of _source expression_ values. Form submissions may be made to URLs that match any of the given source expressions.
 
-- `<host-source>`
-- `<scheme-source>`
-- the keyword value `'self'`.
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources). However, only the following subset of those values apply to `form-action`:
+
+    - `<host-source>`
+    - `<scheme-source>`
+    - the keyword value `'self'`.
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/frame-src/index.md b/files/en-us/web/http/headers/content-security-policy/frame-src/index.md
index 35d6fffe0268aad..9fdc2fb09fc87bb 100644
--- a/files/en-us/web/http/headers/content-security-policy/frame-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/frame-src/index.md
@@ -43,12 +43,15 @@ Content-Security-Policy: frame-src 'none';
 Content-Security-Policy: frame-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/img-src/index.md b/files/en-us/web/http/headers/content-security-policy/img-src/index.md
index a0675410425a9f2..48747be59af919a 100644
--- a/files/en-us/web/http/headers/content-security-policy/img-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/img-src/index.md
@@ -36,12 +36,15 @@ Content-Security-Policy: img-src 'none';
 Content-Security-Policy: img-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/manifest-src/index.md b/files/en-us/web/http/headers/content-security-policy/manifest-src/index.md
index 3b1c2094311fcde..53630b66c4ad36e 100644
--- a/files/en-us/web/http/headers/content-security-policy/manifest-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/manifest-src/index.md
@@ -39,12 +39,15 @@ Content-Security-Policy: manifest-src 'none';
 Content-Security-Policy: manifest-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/media-src/index.md b/files/en-us/web/http/headers/content-security-policy/media-src/index.md
index 4b1c941a179dbab..4a4a653044b0575 100644
--- a/files/en-us/web/http/headers/content-security-policy/media-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/media-src/index.md
@@ -38,12 +38,15 @@ Content-Security-Policy: media-src 'none';
 Content-Security-Policy: media-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/object-src/index.md b/files/en-us/web/http/headers/content-security-policy/object-src/index.md
index 6daf3bfb07e6eb6..352b153352756ca 100644
--- a/files/en-us/web/http/headers/content-security-policy/object-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/object-src/index.md
@@ -45,12 +45,15 @@ Content-Security-Policy: object-src 'none';
 Content-Security-Policy: object-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/prefetch-src/index.md b/files/en-us/web/http/headers/content-security-policy/prefetch-src/index.md
index 3bcc9cf00c2c7bc..797972671628c24 100644
--- a/files/en-us/web/http/headers/content-security-policy/prefetch-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/prefetch-src/index.md
@@ -41,12 +41,15 @@ Content-Security-Policy: prefetch-src 'none';
 Content-Security-Policy: prefetch-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Example
 
diff --git a/files/en-us/web/http/headers/content-security-policy/script-src-attr/index.md b/files/en-us/web/http/headers/content-security-policy/script-src-attr/index.md
index ff1e5c5770032df..cc121edf4c82181 100644
--- a/files/en-us/web/http/headers/content-security-policy/script-src-attr/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/script-src-attr/index.md
@@ -40,12 +40,15 @@ Content-Security-Policy: script-src-attr 'none';
 Content-Security-Policy: script-src-attr <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 `script-src-attr` can be used in conjunction with {{CSP("script-src")}}, and will override that directive for checks on inline handlers:
 
diff --git a/files/en-us/web/http/headers/content-security-policy/script-src-elem/index.md b/files/en-us/web/http/headers/content-security-policy/script-src-elem/index.md
index 5ba5ce17e35a12a..e470b788c93e07a 100644
--- a/files/en-us/web/http/headers/content-security-policy/script-src-elem/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/script-src-elem/index.md
@@ -40,12 +40,15 @@ Content-Security-Policy: script-src-elem 'none';
 Content-Security-Policy: script-src-elem <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 `script-src-elem` can be used in conjunction with {{CSP("script-src")}}:
 
diff --git a/files/en-us/web/http/headers/content-security-policy/script-src/index.md b/files/en-us/web/http/headers/content-security-policy/script-src/index.md
index 0527db048bc9898..008539bce1dce6a 100644
--- a/files/en-us/web/http/headers/content-security-policy/script-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/script-src/index.md
@@ -36,12 +36,15 @@ Content-Security-Policy: script-src 'none';
 Content-Security-Policy: script-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/style-src-attr/index.md b/files/en-us/web/http/headers/content-security-policy/style-src-attr/index.md
index 251f2a8bf599c42..a3c9a4d74c5bb32 100644
--- a/files/en-us/web/http/headers/content-security-policy/style-src-attr/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/style-src-attr/index.md
@@ -41,12 +41,15 @@ Content-Security-Policy: style-src-attr 'none';
 Content-Security-Policy: style-src-attr <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 `style-src-attr` can be used in conjunction with {{CSP("style-src")}}:
 
diff --git a/files/en-us/web/http/headers/content-security-policy/style-src-elem/index.md b/files/en-us/web/http/headers/content-security-policy/style-src-elem/index.md
index df3f4e2509a90c7..cb62d937d765f46 100644
--- a/files/en-us/web/http/headers/content-security-policy/style-src-elem/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/style-src-elem/index.md
@@ -40,12 +40,15 @@ Content-Security-Policy: style-src-elem 'none';
 Content-Security-Policy: style-src-elem <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 `style-src-elem` can be used in conjunction with {{CSP("style-src")}}:
 
diff --git a/files/en-us/web/http/headers/content-security-policy/style-src/index.md b/files/en-us/web/http/headers/content-security-policy/style-src/index.md
index 829cd281be4d8c7..5b206952b69078e 100644
--- a/files/en-us/web/http/headers/content-security-policy/style-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/style-src/index.md
@@ -36,12 +36,15 @@ Content-Security-Policy: style-src 'none';
 Content-Security-Policy: style-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Examples
 
diff --git a/files/en-us/web/http/headers/content-security-policy/worker-src/index.md b/files/en-us/web/http/headers/content-security-policy/worker-src/index.md
index c943eb8399d1eec..031a87ce137daf6 100644
--- a/files/en-us/web/http/headers/content-security-policy/worker-src/index.md
+++ b/files/en-us/web/http/headers/content-security-policy/worker-src/index.md
@@ -44,12 +44,15 @@ Content-Security-Policy: worker-src 'none';
 Content-Security-Policy: worker-src <source-expression-list>;
 ```
 
-This directive may have either:
+This directive may have one of the following values:
 
-- the single keyword value `'none'`, meaning that no resources of this type may be loaded
-- a list of _source expression_ values, meaning that resources of this type may be loaded if they match any of the given source expressions.
+- `'none'`
+  - : No resources of this type may be loaded. The single quotes are mandatory.
+- `<source-expression-list>`
 
-The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
+  - : A space-separated list of _source expression_ values. Resources of this type may be loaded if they match any of the given source expressions.
+
+    The syntax for each source expression is given in [CSP Source Values](/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/Sources).
 
 ## Examples