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Add an implementation of CSS `contain: style`. This introduces two new data structures, the ContainStyleScope and ContainStyleScopeManager. ContainStyleScope manages one `contain: style` "world" which has its own counter and quote lists. The contents of these lists depend on their parent scopes, but are not affected by their children. ContainStyleScopeManager manages a tree of scopes starting at a root scope which is outside of any `contain: style` element. Scopes are stored in a hash table that is keyed off of the nsIContent which establishes the `contain: style` scope. When modifying quote or content lists, the ContainStyleScopeManager is responsible for finding the appropriate `contain: style` scope to modify. Perhaps the most complex part of this is that counters and quotes have read access to the state of counters and quotes that are in ancestor `contain: style` scopes. In the case of counters, USE nodes that are at the beginning of counter lists might have a counter scope that starts in an ancestor `contain: style` scope. When nsCounterNode::SetScope() is called, the code may look upward in the `contain: style` scope tree to find the start of the counter scope. In the case of quotes, the first node in the quote list must look for the state of quotes in ancestor `contain: style` scopes. Differential Revision: https://phabricator.services.mozilla.com/D149508 |
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