diff --git a/files/en-us/glossary/time_to_first_byte/index.md b/files/en-us/glossary/time_to_first_byte/index.md
index 1893afa5a427535..76f6eccbcc6fede 100644
--- a/files/en-us/glossary/time_to_first_byte/index.md
+++ b/files/en-us/glossary/time_to_first_byte/index.md
@@ -15,7 +15,7 @@ const ttfb = performance.getEntriesByType("navigation")[0].responseStart;
 ```
 
 > [!NOTE]
-> For sites using {{HTTPStatus("103", "103 Early Hints")}} TTFB is typically the _first bytes_ (after any redirects) and so the 103 interim response. Site owners wishing to measure the time until the final response should use `{{domxref("PerformanceResourceTiming.finalResponseHeadersStart", "finalResponseHeadersStart")}}` where supported.
+> For sites using {{HTTPStatus("103", "103 Early Hints")}}, TTFB is typically the _first bytes_ (after any redirects) — and so, the 103 interim response. Site owners wishing to measure the time until the final response should use `{{domxref("PerformanceResourceTiming.finalResponseHeadersStart", "finalResponseHeadersStart")}}`, where supported.
 
 ## See also
 
diff --git a/files/en-us/web/api/performanceresourcetiming/finalresponseheadersstart/index.md b/files/en-us/web/api/performanceresourcetiming/finalresponseheadersstart/index.md
index 48c01d7e19ee21a..e2b50bc672699c1 100644
--- a/files/en-us/web/api/performanceresourcetiming/finalresponseheadersstart/index.md
+++ b/files/en-us/web/api/performanceresourcetiming/finalresponseheadersstart/index.md
@@ -12,7 +12,7 @@ browser-compat: api.PerformanceResourceTiming.finalResponseHeadersStart
 
 The **`finalResponseHeadersStart`** read-only property returns a {{domxref("DOMHighResTimeStamp","timestamp")}} immediately after the browser receives the first byte of the final document response (for example, 200 OK) from the server.
 
-This differs from **`{{domxref("PerformanceResourceTiming.requestStart", "requestStart")}}`** (which may also be represented as **`{{domxref("PerformanceResourceTiming.firstInterimResponseStart", "firstInterimResponseStart")}}`**) as this starts from the first bytes of any response including interim responses (for example, 103 Early Hints) with the final response coming potentially much later.
+This differs from **`{{domxref("PerformanceResourceTiming.requestStart", "requestStart")}}`** (which may also be represented as **`{{domxref("PerformanceResourceTiming.firstInterimResponseStart", "firstInterimResponseStart")}}`**), as this starts from the first bytes of any response including interim responses (for example, 103 Early Hints) with the final response coming potentially much later.
 
 When there are no interim responses, `requestStart` is the same as `finalResponseHeadersStart` and `firstInterimResponseStart` is 0.
 
@@ -29,7 +29,7 @@ The `finalResponseHeadersStart` property can have the following values:
 
 ### Measuring request time
 
-The `finalResponseHeadersStart` and {{domxref("PerformanceResourceTiming.requestStart", "requestStart")}} properties can be used to measure how long it takes to the browser to start receive the final response after the sending the request.
+The `finalResponseHeadersStart` and {{domxref("PerformanceResourceTiming.requestStart", "requestStart")}} properties can be used to measure how long it takes for the browser to start receive the final response after the sending the request.
 
 ```js
 const request = entry.finalResponseHeadersStart - entry.requestStart;
@@ -62,7 +62,7 @@ resources.forEach((entry) => {
 });
 ```
 
-The following example shnows how to measure the time between the first and final response headers.
+The following example shows how to measure the time between the first and final response headers.
 
 ```js
 const observer = new PerformanceObserver((list) => {