environment default <code>User-Agent</code> value

# Conflicts:
#	fetch.bs

Author: sadym-chromium

fetch.bs

@@ -1420,6 +1420,24 @@ downloads. This format of range header value can be set using <a>add a range hea
 have this value start with `<code>Mozilla/5.0 (</code>` and be generally modeled after other web
 browsers.
 
+<div algorithm>
+<p>To get the <dfn export id=environment-default-user-agent-value>environment default `<code>User-Agent</code>` value</dfn>
+for an <a>environment settings object</a> <var>environment</var>:
+
+<ol>
+ <li><p>Let <var>userAgent</var> be the <a>WebDriver BiDi emulated User-Agent</a> for
+ <var>environment</var>.
+
+ <li><p>If <var>userAgent</var> is not null, then set <var>userAgent</var> to
+ <a>isomorphic encoded</a> <var>userAgent</var>.
+
+ <li><p>Otherwise, set <var>userAgent</var> to <a>default `<code>User-Agent</code>` value</a>.
+
+ <li><p><a for="header list">Append</a> (`<code>User-Agent</code>`, <var>userAgent</var>) to
+ <var>httpRequest</var>'s <a for=request>header list</a>.
+</ol>
+</div>
+
 <p>The <dfn>document `<code>Accept</code>` header value</dfn> is
 `<code>text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8</code>`.
 
@@ -5988,17 +6006,12 @@ run these steps:
 
    <li>
     <p>If <var>httpRequest</var>'s <a for=request>header list</a> <a
-    for="header list">does not contain</a> `<code>User-Agent</code>`:
+    for="header list">does not contain</a> `<code>User-Agent</code>`, then user agents should run
+    the following steps:
 
     <ol>
-     <li><p>Let <var>userAgent</var> be the result of running the
-     <a>WebDriver BiDi emulated User-Agent</a> with <var>httpRequest</var>'s
-     <a for=request>client</a>.
-
-     <li><p>If <var>userAgent</var> is not null, then set <var>userAgent</var> to
-     <a>isomorphic encoded</a> <var>userAgent</var>.
-
-     <li><p>Otherwise, set <var>userAgent</var> to <a>default `<code>User-Agent</code>` value</a>.
+     <li><p>Let <var>userAgent</var> be the <var>httpRequest</var>'s <a for=request>client</a>'s
+     <a>environment default `<code>User-Agent</code>` value</a>.
 
      <li><p><a for="header list">Append</a> (`<code>User-Agent</code>`, <var>userAgent</var>) to
      <var>httpRequest</var>'s <a for=request>header list</a>.