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Remove obsolete permitted DOCTYPEs
From now on conformance checkers can only allow <!doctype html> and <!doctype html SYSTEM "about:legacy-compat"> as doctypes in HTML syntax. The HTML4 and XHTML1 DOCTYPEs are no longer allowed. (XHTML syntax continues to be supported and is not influenced by this change.)
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@@ -98484,7 +98484,7 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
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<li>A string that is an <span>ASCII case-insensitive</span> match for the string "<code data-x="">&lt;!DOCTYPE</code>".</li>
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<li>One or more <span data-x="space character">space characters</span>.</li>
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<li>A string that is an <span>ASCII case-insensitive</span> match for the string "<code data-x="">html</code>".</li>
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<li>Optionally, a <span>DOCTYPE legacy string</span> or an <span>obsolete permitted DOCTYPE string</span> (defined below).</li>
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<li>Optionally, a <span>DOCTYPE legacy string</span>.</li>
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<li>Zero or more <span data-x="space character">space characters</span>.</li>
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<li>A U+003E GREATER-THAN SIGN character (&gt;).</li>
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</ol>
@@ -98513,62 +98513,6 @@ dictionary <dfn>StorageEventInit</dfn> : <span>EventInit</span> {
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<p>The <span>DOCTYPE legacy string</span> should not be used unless the document is generated from
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a system that cannot output the shorter string.</p>
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<hr>
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<!-- see the parser section before changing this bit -->
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<p>To help authors transition from HTML4 and XHTML1, an <dfn>obsolete permitted DOCTYPE
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string</dfn> can be inserted into the DOCTYPE (in the position defined above). This string must
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consist of:</p>
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<ol class="brief">
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<li>One or more <span data-x="space character">space characters</span>.</li>
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<li>A string that is an <span>ASCII case-insensitive</span> match for the string "<code data-x="">PUBLIC</code>".</li>
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<li>One or more <span data-x="space character">space characters</span>.</li>
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<li>A U+0022 QUOTATION MARK or U+0027 APOSTROPHE character (the <i>first quote mark</i>).</li>
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<li>The string from one of the cells in the first column of the table below. The row to which this cell belongs is the <i>selected row</i>.</li>
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<li>A matching U+0022 QUOTATION MARK or U+0027 APOSTROPHE character (i.e. the same character as in the earlier step labeled <i>first quote mark</i>).</li>
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<li>If the cell in the second column of the <i>selected row</i> is not blank, one or more <span data-x="space character">space characters</span>.</li>
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<li>If the cell in the second column of the <i>selected row</i> is not blank, a U+0022 QUOTATION MARK or U+0027 APOSTROPHE character (the <i>third quote mark</i>).</li>
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<li>If the cell in the second column of the <i>selected row</i> is not blank, the string from the cell in the second column of the <i>selected row</i>.</li>
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<li>If the cell in the second column of the <i>selected row</i> is not blank, a matching U+0022 QUOTATION MARK or U+0027 APOSTROPHE character (i.e. the same character as in the earlier step labeled <i>third quote mark</i>).</li>
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</ol>
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<table>
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<caption>
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Allowed values for public and system identifiers in an <span>obsolete permitted DOCTYPE string</span>.
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</caption>
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<thead>
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<tr>
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<th> Public identifier
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<th> System identifier
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<tbody>
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<tr>
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<td> <code data-x="">-//W3C//DTD&nbsp;HTML&nbsp;4.0//EN</code>
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<td>
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<tr>
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<td> <code data-x="">-//W3C//DTD&nbsp;HTML&nbsp;4.0//EN</code>
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<td> <code data-x="">http://www.w3.org/TR/REC-html40/strict.dtd</code>
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<tr>
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<td> <code data-x="">-//W3C//DTD&nbsp;HTML&nbsp;4.01//EN</code>
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<td>
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<tr>
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<td> <code data-x="">-//W3C//DTD&nbsp;HTML&nbsp;4.01//EN</code>
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<td> <code data-x="">http://www.w3.org/TR/html4/strict.dtd</code>
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<tr>
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<td> <code data-x="">-//W3C//DTD&nbsp;XHTML&nbsp;1.0&nbsp;Strict//EN</code>
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<td> <code data-x="">http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd</code>
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<tr>
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<td> <code data-x="">-//W3C//DTD&nbsp;XHTML&nbsp;1.1//EN</code>
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<td> <code data-x="">http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd</code>
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</table>
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<p>A <span data-x="syntax-doctype">DOCTYPE</span> containing an <span>obsolete permitted DOCTYPE
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string</span> is an <dfn>obsolete permitted DOCTYPE</dfn>. Authors should not use <span
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data-x="obsolete permitted DOCTYPE">obsolete permitted DOCTYPEs</span>, as they are unnecessarily
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long.</p>
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9857298516

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<h4>Elements</h4>
@@ -104087,44 +104031,7 @@ document.body.appendChild(text);
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<p>If the DOCTYPE token's name is not a <span>case-sensitive</span> match for the string "<code
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data-x="">html</code>", or the token's public identifier is not missing, or the token's system
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identifier is neither missing nor a <span>case-sensitive</span> match for the string
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"<code>about:legacy-compat</code>", and none of the sets of conditions in the following list are
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matched, then there is a <span>parse error</span>.</p>
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<ul>
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<!-- only things that trigger no-quirks mode and were valid in some other spec are allowed in
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this list -->
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<li>The DOCTYPE token's name is a <span>case-sensitive</span> match for the string "<code
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data-x="">html</code>", the token's public identifier is the <span>case-sensitive</span> string
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"<code data-x="">-//W3C//DTD&nbsp;HTML&nbsp;4.0//EN</code>", and the token's system identifier
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is either missing or the <span>case-sensitive</span> string "<code
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data-x="">http://www.w3.org/TR/REC-html40/strict.dtd</code>".</li>
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<li>The DOCTYPE token's name is a <span>case-sensitive</span> match for the string "<code
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data-x="">html</code>", the token's public identifier is the <span>case-sensitive</span> string
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"<code data-x="">-//W3C//DTD&nbsp;HTML&nbsp;4.01//EN</code>", and the token's system identifier
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is either missing or the <span>case-sensitive</span> string "<code
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data-x="">http://www.w3.org/TR/html4/strict.dtd</code>".</li>
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<li>The DOCTYPE token's name is a <span>case-sensitive</span> match for the string "<code
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data-x="">html</code>", the token's public identifier is the <span>case-sensitive</span> string
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"<code data-x="">-//W3C//DTD&nbsp;XHTML&nbsp;1.0&nbsp;Strict//EN</code>", and the token's system
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identifier is the <span>case-sensitive</span> string "<code
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data-x="">http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd</code>".</li>
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<li>The DOCTYPE token's name is a <span>case-sensitive</span> match for the string "<code
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data-x="">html</code>", the token's public identifier is the <span>case-sensitive</span> string
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"<code data-x="">-//W3C//DTD&nbsp;XHTML&nbsp;1.1//EN</code>", and the token's system identifier
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is the <span>case-sensitive</span> string "<code
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data-x="">http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd</code>".</li>
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</ul>
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<p>Conformance checkers may, based on the values (including presence or lack thereof) of the
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DOCTYPE token's name, public identifier, or system identifier, switch to a conformance checking
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mode for another language (e.g. based on the DOCTYPE token a conformance checker could recognize
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that the document is an HTML4-era document, and defer to an HTML4 conformance checker.)</p>
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"<code>about:legacy-compat</code>", then there is a <span>parse error</span>.</p>
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<p>Append a <code>DocumentType</code> node to the <code>Document</code> node, with the <code
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data-x="">name</code> attribute set to the name given in the DOCTYPE token, or the empty string
@@ -112134,10 +112041,6 @@ if (s = prompt('What is your name?')) {
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regardless is to help legacy user agents that do not support <code>input</code> elements with
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<code data-x="">type="number"</code> to still render the text control with a useful width.</p>
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<p class="note">In <span>the HTML syntax</span>, specifying a <span
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data-x="syntax-DOCTYPE">DOCTYPE</span> that is an <span>obsolete permitted DOCTYPE</span> will also
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trigger a warning.</p>
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<div w-nodev>
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@@ -112155,9 +112058,6 @@ if (s = prompt('What is your name?')) {
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<ul><!-- downplayed list -->
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<li><p>The presence of an <span>obsolete permitted DOCTYPE</span> in an <span data-x="HTML
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documents">HTML document</span>.</p></li>
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<li><p>The presence of a <code data-x="attr-img-border">border</code> attribute on an
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<code>img</code> element if its value is the string "<code data-x="">0</code>".</p></li>
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