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[css-properties-values-api] Remove unregisterProperty. #764

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Jun 7, 2018
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[css-properties-values-api] Remove unregisterProperty. #764

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36 changes: 2 additions & 34 deletions css-properties-values-api/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -74,7 +74,6 @@ dictionary PropertyDescriptor {

partial interface CSS {
static void registerProperty(PropertyDescriptor descriptor);
static void unregisterProperty(DOMString name);
};
</pre>

Expand All @@ -100,7 +99,7 @@ following members:
: <dfn dict-member for=PropertyDescriptor>initialValue</dfn>
:: The initial value of this custom property.

The {{registerProperty()}} and {{unregisterProperty()}} functions {#the-registerproperty-function}
The {{registerProperty()}} function {#the-registerproperty-function}
--------------------------------------------------------------------------------------------------

The <dfn method for=CSS>registerProperty(PropertyDescriptor descriptor)</dfn> method
Expand Down Expand Up @@ -230,38 +229,7 @@ the process via which specified values for that property are turned into compute
is defined fully by the type selected,
as described in [[#calculation-of-computed-values]].

Properties can be unregistered using
<dfn method for=CSS>unregisterProperty(DOMString name)</dfn>.
When it is called,
it executes the <a>unregister a custom property</a> algorithm,
with a <code>name</code> set to its sole argument.

<div algorithm>
To <dfn>unregister a custom property</dfn> with the name |name|:

1. Let |property set|
be the value of the
<a>current global object's</a>
<a>associated <code>Document</code></a>'s
{{[[registeredPropertySet]]}} slot.

2. Attempt to parse |name|
as a <<custom-property-name>>.
If this fails,
<a>throw</a> a {{SyntaxError}}
and exit this algorithm.

Otherwise,
let |parsed name| be the parsed value.

3. If |property set|
contains a record with a property name matching |parsed name|
(compared codepoint-wise),
remove the record from |property set|.

Otherwise,
<a>throw</a> a {{NotFoundError}}.
</div>
Note: A way to unregister properties may be added in the future.

When the <a>current global object's</a> <a>associated <code>Document</code></a>'s {{[[registeredPropertySet]]}} changes,
previously syntactically invalid property values can become valid and vice versa.
Expand Down