Mention that DurationFormat only takes integer components (#37980)

mdn · Feb 6, 2025 · 415324c · 415324c
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diff --git a/...-us/web/javascript/reference/global_objects/intl/durationformat/format/index.md b/...-us/web/javascript/reference/global_objects/intl/durationformat/format/index.md
@@ -18,7 +18,7 @@ format(duration)
 ### Parameters
 
 - `duration`
-  - : The duration object to be formatted. It should include some or all of the following properties: `years`, `months`, `weeks`, `days`, `hours`, `minutes`, `seconds`, `milliseconds`, `microseconds`, `nanoseconds`. Can be a {{jsxref("Temporal.Duration")}} object.
+  - : The duration object to be formatted. It should include some or all of the following properties: `years`, `months`, `weeks`, `days`, `hours`, `minutes`, `seconds`, `milliseconds`, `microseconds`, `nanoseconds`. Each property's value should be an integer, and their signs should be consistent. This can be a {{jsxref("Temporal.Duration")}} object; see the {{jsxref("Temporal.Duration")}} documentation for more information about these properties.
 
 ### Return value
 

diff --git a/.../javascript/reference/global_objects/intl/durationformat/formattoparts/index.md b/.../javascript/reference/global_objects/intl/durationformat/formattoparts/index.md
@@ -18,7 +18,7 @@ formatToParts(duration)
 ### Parameters
 
 - `duration` {{optional_inline}}
-  - : The duration object to be formatted. It should include some or all of the following properties: `years`, `months`, `weeks`, `days`, `hours`, `minutes`, `seconds`, `milliseconds`, `microseconds`, `nanoseconds`. Can be a {{jsxref("Temporal.Duration")}} object.
+  - : The duration object to be formatted. It should include some or all of the following properties: `years`, `months`, `weeks`, `days`, `hours`, `minutes`, `seconds`, `milliseconds`, `microseconds`, `nanoseconds`. Each property's value should be an integer, and their signs should be consistent. This can be a {{jsxref("Temporal.Duration")}} object; see the {{jsxref("Temporal.Duration")}} documentation for more information about these properties.
 
 ### Return value