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computedStyleMap() must return same object #688

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Merged
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Feb 20, 2018
Merged

computedStyleMap() must return same object #688

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e835f04
computedStyleMap() must return same object
darrnshn Feb 19, 2018
e72f693
Add explicit caching logic to computedStyleMap()
darrnshn Feb 20, 2018
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10 changes: 9 additions & 1 deletion css-typed-om/Overview.bs
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Expand Up @@ -553,19 +553,27 @@ partial interface Element {
represent the [=computed values=] of an {{Element}},
and are accessed by calling the {{Element/computedStyleMap()}} method.

Every {{Element}} has a <dfn attribute for=Element>\[[computedStyleMapCache]]</dfn> internal slot,
initially set to `null`,
which caches the result of the {{Element/computedStyleMap()}} method
when it is first called.

<div algorithm>
The <dfn method for="Element">computedStyleMap()</dfn> method must,
when called on an {{Element}} |this|,
perform the following steps:

1. Return a live {{StylePropertyMapReadOnly}} object,
1. If |this|'s {{Element/[[computedStyleMapCache]]}} internal slot is set to `null`,
set its value to a live {{StylePropertyMapReadOnly}} object,
whose {{[[declarations]]}} internal slot internal slot are the name and [=computed value=] of
every longhand CSS property supported by the User Agent,
every registered [=custom property=],
and every non-registered [=custom property=] which is not set to its initial value
on |this|,
ordered by putting CSS-defined properties before custom properties,
then sorting by code-point order of property name within those two categories.

2. Return |this|'s {{Element/[[computedStyleMapCache]]}} internal slot.
</div>

Note: like {{Window/getComputedStyle()|Window.getComputedStyle()}},
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