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Commit 59d550b

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Make object-valued user prompt handler defaults always override
Previously an object value for the unhandledPromptBehavior capability like: { "default": "dismiss" } was equivalent to the string value "dismiss" which for legacy reasons does not affect "beforeUnload" prompts. For WebDriver-BiDi session we'd ideally like to remove this special case and have the default value apply to all prompt types. Therefore this changes things so that an object value with a default key provides a default that applies to all prompt types, whereas the traditional string values only apply to alert/confirm/prompt dialogs. This preserves classic semantics for string-only values, but makes the object values behave in a more uniform way.
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‎index.html‎

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@@ -10481,8 +10481,11 @@ <h3>User Prompt Handler</h3>
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<p class="note">This is to avoid [[WebDriver-BiDi]] monkey-patching
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the current spec.
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<li><p>Let <var>is string value</var> be false.
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<li><p>If <var>value</var> is a <a>string</a> set <var>value</var> to
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the <a data-cite=infra>map</a> «["<code>default</code>" → <var>value</var>]».
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the <a data-cite=infra>map</a> «["<code>fallbackDefault</code>"
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<var>value</var>]» and set <var>is string value</var> to true.
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<li><p>If <var>value</var> is not a <a data-cite=infra>map</a> return
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<a>error</a> with <a>error code</a> <a>invalid argument</a>.
@@ -10492,9 +10495,9 @@ <h3>User Prompt Handler</h3>
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<li><p>For each <var>prompt type</var><var>handler</var> in <var>value</var>:
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<ol>
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<li><p>If <a>valid prompt types</a> does
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not [=map/contain=] <var>prompt type</var> return <a>error</a>
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with <a>error code</a> <a>invalid argument</a>.
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<li><p>If <var>is string value</var> is false and <a>valid prompt
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types</a> does not [=map/contain=] <var>prompt type</var>
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return <a>error</a>with <a>error code</a> <a>invalid argument</a>.
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<li><p>If <a>known prompt handlers</a> does not contain an entry
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with <a>handler key</a> <var>handler</var> return <a>error</a>
@@ -10584,9 +10587,9 @@ <h3>User Prompt Handler</h3>
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<li><p>If the <a>user prompt handler</a> has [=map/size=] 1,
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and <a>user prompt handler</a> [=list/contains=]
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"<code>default</code>", return the result of <a>serialize a prompt
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"<code>fallbackDefault</code>", return the result of <a>serialize a prompt
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handler configuration</a> with <a>user prompt
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handler</a>["<code>default</code>"].
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handler</a>["<code>fallbackDefault</code>"].
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<li><p>Let <var>serialized</var> be an empty <a data-cite=infra>map</a>.
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@@ -10623,12 +10626,15 @@ <h3>User Prompt Handler</h3>
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<li><p>If <var>handlers</var> contains <var>type</var>
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return <var>handlers</var>[<var>type</var>].
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<li><p>If <var>handlers</var> contains "<code>default</code>"
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return <var>handlers</var>["<code>default</code>"].
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<li><p>If <var>type</var> is "<code>beforeUnload</code>", return a
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<a>prompt handler configuration</a> with [=prompt
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handler configuration/handler=] "<code>accept</code>"
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and [=prompt handler configuration/notify=] false.
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<li><p>If <var>handlers</var> contains "<code>default</code>"
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<li><p>If <var>handlers</var> contains "<code>fallbackDefault</code>"
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return <var>handlers</var>["<code>default</code>"].
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<li><p>Return a <a>prompt handler

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