Re: [whatwg/dom] Clarify insert-node's record's previousSibling (#464)

The "insert a node into a parent before a child" algorithm is invoked from the following algorithms:
 * "pre-insert a node into a parent",
 * "replace a child with node within a parent",
 * "replace all with a node within a parent"
 * "split a Text node"

In the first three, the "adopt a node into document" algorithm will have been run on *node*, removing it from any parent it may have had. In the last, *node* will be a new node, which does not have a parent. As a result, *node* can not be *child*'s previous sibling at this point of the "insert node" algorithm. I wouldn't mind adding a check for this case, but that would produce dead code in implementations that directly follow the spec.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/whatwg/dom/pull/464#issuecomment-311652547