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Allow <hr> to be used inside <select> as a separator #9124

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May 2, 2023
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Allow <hr> to be used inside <select> as a separator #9124

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Allow <hr> to be used inside <select> as a separator
annevk Apr 5, 2023
df5c9aa
address review feedback
annevk Apr 22, 2023
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Expand Up @@ -19333,6 +19333,7 @@ and is further discussed below.&lt;/div></code></pre>
<dd><span>Flow content</span>.</dd>
<dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
<dd>Where <span>flow content</span> is expected.</dd>
<dd>As a child of a <code>select</code> element, when preceded and followed by an <code>option</code> element.</dd>
<dt><span data-x="concept-element-content-model">Content model</span>:</dt>
<dd><span data-x="concept-content-nothing">Nothing</span>.</dd>
<dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
Expand All @@ -19354,8 +19355,8 @@ interface <dfn interface>HTMLHRElement</dfn> : <span>HTMLElement</span> {
</dl>

<p>The <code>hr</code> element <span>represents</span> a <span>paragraph</span>-level thematic
break, e.g. a scene change in a story, or a transition to another topic within a section of a
reference book.</p>
break, e.g., a scene change in a story, a transition to another topic within a section of a
reference book, or a separator between a set of options of a <code>select</code> element.</p>
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<div class="example">

Expand Down Expand Up @@ -52219,7 +52220,8 @@ interface <dfn interface>HTMLButtonElement</dfn> : <span>HTMLElement</span> {
<dt><span data-x="concept-element-contexts">Contexts in which this element can be used</span>:</dt>
<dd>Where <span>phrasing content</span> is expected.</dd>
<dt><span data-x="concept-element-content-model">Content model</span>:</dt>
<dd>Zero or more <code>option</code>, <code>optgroup</code>, and <span data-x="script-supporting elements">script-supporting</span> elements.</dd>
<dd>Either: Zero or more <code>option</code>, <code>optgroup</code>, and <span data-x="script-supporting elements">script-supporting</span> elements.</dd>
<dd>Or: Zero or more <code>option</code> elements, optionally separated from each other by an <code>hr</code> element, and optionally intermixed with <span data-x="script-supporting elements">script-supporting</span> elements.</dd>
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<dt><span data-x="concept-element-attributes">Content attributes</span>:</dt>
<dd><span>Global attributes</span></dd>
<dd><code data-x="attr-fe-autocomplete">autocomplete</code></dd>
Expand Down Expand Up @@ -52773,6 +52775,19 @@ interface <dfn interface>HTMLSelectElement</dfn> : <span>HTMLElement</span> {

</div>

<div class="example">
<p>Occasionally it can be useful to have a separator:

<pre><code class="html">&lt;label>
Select the song to play next:
&lt;select required name="next">
&lt;option value="sr">Random
&lt;hr>
&lt;option value="s1">It Sucks to Be Me (Reprise)
&lt;option value="s2">There is Life Outside Your Apartment
&hellip;</code></pre>
</div>



<h4>The <dfn element><code>datalist</code></dfn> element</h4>
Expand Down Expand Up @@ -112706,9 +112721,9 @@ dictionary <dfn dictionary>StorageEventInit</dfn> : <span>EventInit</span> {

<!-- </option> -->
<p>An <code>option</code> element's <span data-x="syntax-end-tag">end tag</span> may be omitted if
the <code>option</code> element is immediately followed by another <code>option</code> element, or
if it is immediately followed by an <code>optgroup</code> element, or if there is no more content
in the parent element.</p>
the <code>option</code> element is immediately followed by another <code>option</code> element, if
it is immediately followed by an <code>optgroup</code> element, if it is immediately followed by
an <code>hr</code> element, or if there is no more content in the parent element.</p>

<!-- <colgroup> -->
<p>A <code>colgroup</code> element's <span data-x="syntax-start-tag">start tag</span> may be
Expand Down Expand Up @@ -120898,6 +120913,27 @@ document.body.appendChild(text);
<p><span>Insert an HTML element</span> for the token.</p>
</dd>

<dt>A start tag whose tag name is "hr"</dt>
<dd>
<!-- fake </option> (maybe) -->
<p>If the <span>current node</span> is an <code>option</code> element, pop that node from the
<span>stack of open elements</span>.</p>
<!-- end of fake </option> -->

<p>If the <span>current node</span> is an <code>optgroup</code> element, <span>parse
error</span>; ignore the token.</p>
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<p>Otherwise, run these steps:</p>

<ol>
<li><p><span>Insert an HTML element</span> for the token. Immediately pop the <span>current
node</span> off the <span>stack of open elements</span>.</p></li>

<li><p><span data-x="acknowledge self-closing flag">Acknowledge the token's <i
data-x="self-closing flag">self-closing flag</i></span>, if it is set.</p></li>
</ol>
</dd>

<dt>An end tag whose tag name is "optgroup"</dt>
<dd>
<!-- fake </option> (maybe) -->
Expand Down Expand Up @@ -125793,6 +125829,9 @@ progress { appearance: auto; }</code></pre>
data-x="concept-option-label">label</span>, indented under its <code>optgroup</code> element if it
has one.</p>

<p>Each sequence of one or more child <code>hr</code> element siblings may be rendered as a single
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Why this optional behavior? Why not render two separators?

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Thanks for the review! I'll update the tests so we can land this.

As widgets are sometimes rendered by the OS I didn't want to require features that might not exist. And as it's a fairly minor semantic it doesn't really matter if it's not supported. It's just nicer when it is.

And a single separator is rendered because that is what Chromium and WebKit implement today and breaking with that seemed unnecessary:
data:text/xml,<select%20xmlns="http://www.w3.org/1999/xhtml"><option>1</option><hr/><hr/><option>2</option></select>.

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Ok, makes sense to me!

separator.</p>

<p>The <dfn>width of the <code>select</code>'s labels</dfn> is the wider of the width necessary to
render the widest <code>optgroup</code>, and the width necessary to render the widest
<code>option</code> element in the element's <span data-x="concept-select-option-list">list of
Expand Down Expand Up @@ -133994,16 +134033,16 @@ INSERT INTERFACES HERE
Dean Edridge,
Dean Edwards,
Dean Jackson,
Debanjana Sarkar <!-- debanjana-a11y on GitHub -->,
Debanjana Sarkar, <!-- debanjana-a11y on GitHub -->
Debi Orton,
Delan Azabani<!-- delan on GitHub -->,
Delan Azabani, <!-- delan on GitHub -->
Derek Featherstone,
Derek Guenther,
Devarshi Pant,
Devdatta,
Devin Rousso,
Diego Ferreiro Val,
Diego Gonz&aacute;lez Z&uacute;&ntilde;iga <!-- diekus on GitHub -->,
Diego Gonz&aacute;lez Z&uacute;&ntilde;iga, <!-- diekus on GitHub -->
Diego Ponce de León,
Dimitri Glazkov,
Dimitry Golubovsky,
Expand Down Expand Up @@ -134047,6 +134086,7 @@ INSERT INTERFACES HERE
Eric Portis,
Eric Rescorla,
Eric Semling,
Eric Shepherd, <!-- a2sheppy on GitHub -->
Eric Willigers,
Erik Arvidsson,
Erik Charlebois,
Expand Down