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[css-highlight-api] Misc highlight priority fixes based on recent resolutions #6136

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Merged
merged 3 commits into from
Mar 24, 2021
Merged

[css-highlight-api] Misc highlight priority fixes based on recent resolutions #6136

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e3a1706
[css-highlight-api] Remove text for resolved highlight priority issues.
sanketj Mar 24, 2021
aac02c6
[css-highlight-api] Highlight priority attribute should be long inste…
sanketj Mar 24, 2021
fc0c6b6
[css-highlight-api] Add comment about the default numerical priority …
sanketj Mar 24, 2021
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27 changes: 4 additions & 23 deletions css-highlight-api-1/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -169,7 +169,7 @@ Creating Custom Highlights
interface Highlight {
constructor(CSSOMString name, AbstractRange... initialRanges);
setlike;
attribute double priority;
attribute long priority;
readonly attribute CSSOMString name;
};
Expand Down Expand Up @@ -352,31 +352,12 @@ Priority of Overlapping Highlights
This is used to determine the stacking order of the corresponding [=highlight overlay=]
during painting operations (see [[#painting]]).
A higher [=priority=] results in being above in the stacking order.
A custom highlight will have a default numerical priority of 0
if its {{Highlight/priority}} attribute has not been explicitly set.

When two ore more [=custom highlights=] have the same numerical priority,
When two or more [=custom highlights=] have the same numerical priority,
the one most recently [=registered=] has the higher effective [=priority=].

Issue(4593): should negative numbers mean stacking
below the built-in [=highlight pseudo-elements=]?

Issue(4592): Should priority be an (unsigned) integer instead?
That would make comparisons more reliable,
but would likely lead to numbering reminiscent of BASIC line numbers.

Issue(4591): Should we drop priority by numbers entirely,
and replace it with some other ordering mechanism?
Experience with BASIC line number or z-index
does not give much confidence that ordering by number is a good idea.
Is placing in an ordered data-structure better?
Should authors be able to express a desired to be placed above/below
other named highlights,
and let the UA figure it out?

Issue(4594): Should the built-in [=highlight pseudo-elements=]
be exposed as well,
so that they too can be reordered,
and so that they can be interleaved with custom ones freely?

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