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Add safePrintableInset parameter for printing. #1950

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Add safePrintableInset parameter for printing. #1950

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Add safePrintableInset parameter for printing.
mstensho Feb 25, 2026
75e3e5a
Code review
mstensho Feb 27, 2026
7e8f49f
Link to spec
mstensho Apr 7, 2026
5f98639
Code review.
mstensho Aug 14, 2026
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15 changes: 15 additions & 0 deletions index.html
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Expand Up @@ -11313,6 +11313,13 @@ <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>.
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<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
<var>parameters</var> with default of an
Expand Down Expand Up @@ -11364,6 +11371,14 @@ <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
<a href="https://drafts.csswg.org/css-page-3/#page-margin-safety">CSS rules</a>
to adjust page margins based on this.

@gsnedders gsnedders Aug 13, 2026

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This should cross-reference https://drafts.csswg.org/css-page-3/#printable-area, should it not? We don't need to redefine what a printable/unprintable area is when we can just cross-reference it.

I'd be tempted to say something more along the lines of:

The value of safePrintableInset defines the width [ XXX: in what units? presumably cm to match everything else in WebDriver? ] of the non-printable area on all sides of the page sheet.

With the current text here I genuinely don't know where to start, because I don't know what this corresponds to, and what I'm meant to be changing as an implementer.

But also: shouldn't this just be in the table above? You're changing properties of the "paper" that CSS is targeting, right?

@mstensho mstensho Aug 14, 2026

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Please take another look now.


<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
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