From 1891456b6eba0b827c53e8463b69eca2fcd9b76c Mon Sep 17 00:00:00 2001
From: Morten Stenshorne <mstensho@chromium.org>
Date: Wed, 25 Feb 2026 08:41:44 +0100
Subject: [PATCH 1/2] Add safePrintableInset parameter for printing.

This is for testing the `page-margin-safety` descriptor in `@page` and
page margin box contexts.

Spec discussion: https://github.com/w3c/csswg-drafts/issues/11395
Spec change: https://github.com/w3c/csswg-drafts/pull/13190
RFC: https://github.com/web-platform-tests/rfcs/pull/233

wptrunner and webdriver code changes:
https://github.com/web-platform-tests/wpt/pull/58030
---
 index.html | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/index.html b/index.html
index f2d116d7..3a540a3e 100644
--- a/index.html
+++ b/index.html
@@ -11313,6 +11313,14 @@ <h3><dfn>Print Page</dfn></h3>
  <li><p>If <var>shrinkToFit</var> is not a <a>Boolean</a>
  return <a>error</a> with <a>error code</a> <a>invalid argument</a>.
 
+ <li><p>Let <var>safePrintableInset</var> be the result of <a>getting a
+  property with default</a> named "<code>safePrintableInset</code>" and with
+  default <code>0</code> from <var>parameters</var>.
+
+ <li><p>If <var>safePrintableInset</var> is not a <a>Number</a>, or is a
+  negative number, return <a>error</a> with <a>error code</a> <a>invalid
+  argument</a>.
+
  <li><p>Let <var>pageRanges</var> be the result of <a>getting a
   property with default</a> named "<code>pageRanges</code>" from
   <var>parameters</var> with default of an

From 75e3e5af787e22d2f909732343c918c52a5b556d Mon Sep 17 00:00:00 2001
From: Morten Stenshorne <mstensho@chromium.org>
Date: Fri, 27 Feb 2026 08:30:03 +0100
Subject: [PATCH 2/2] Code review

---
 index.html | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/index.html b/index.html
index 3a540a3e..6483d648 100644
--- a/index.html
+++ b/index.html
@@ -11317,9 +11317,8 @@ <h3><dfn>Print Page</dfn></h3>
   property with default</a> named "<code>safePrintableInset</code>" and with
   default <code>0</code> from <var>parameters</var>.
 
- <li><p>If <var>safePrintableInset</var> is not a <a>Number</a>, or is a
-  negative number, return <a>error</a> with <a>error code</a> <a>invalid
-  argument</a>.
+ <li><p>If <var>safePrintableInset</var> is not a <a>Number</a>, or is less than 0,
+ return <a>error</a> with <a>error code</a> <a>invalid argument</a>.
 
  <li><p>Let <var>pageRanges</var> be the result of <a>getting a
   property with default</a> named "<code>pageRanges</code>" from
@@ -11372,6 +11371,13 @@ <h3><dfn>Print Page</dfn></h3>
        page width specified in the content
      </dl>
 
+   <p>The value of <var>safePrintableInset</var> defines the minimum inset along
+   each page edge needed to steer clear of the area that the printer is potentially
+   incapable of marking reliably. Most printers have a small region along each
+   edge of the page sheet which is unprintable, typically due to the printer's
+   paper handling mechanism. The document that is being printed may have CSS rules
+   to adjust page margins based on this. TODO: Link to spec, when it has landed?
+
   <li><p>If <var>pageRanges</var> is not an empty <a>Array</a>,
  Let <var>pages</var> be the result of <a>trying</a> to <a>parse a
  page range</a> with arguments <var>pageRanges</var> and the number of