Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

…rweb-io#1468)

Setting of the `crossorigin` attribute is not necessary for same-origin images, and causes an immediate image reload (albeit from cache) necessitating the use of a load event listener which subsequently mutates the snapshot.  This change allows us to  avoid the mutation of the snapshot for the same-origin case.

* Modify inlineImages test to remove delay and show that we can inline images without mutation

* Add an explicit test for when the `image.crossOrigin = 'anonymous';` method is necessary.  Uses a combination of about:blank and our test server to simulate a cross-origin context

* Other test changes: there were some spurious rrweb mutations being generated by the addition of the crossorigin attribute that are now elimnated from the rrweb/__snapshots__/integration.test.ts.snap after this PR - this is good

fix for options `recordCanvas: true`: 
* replace document.createElement with doc.createElement in rrweb-snapshot code
* Eoghan: add a regression test to prevent future accidental use of `document` instead of `doc`.  This test can be excised if a new feature can only be run in the browser and not in the jsdom environment

* Older versions of Safari 16 don't support lookbehind assertions - https://caniuse.com/js-regexp-lookbehind

* Refactor to show the similarity between these two regexes

* Apply formatting changes

* Create no-neg-lookbehind.md

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Co-authored-by: eoghanmurray <[email protected]>

* Refactor to preclude the need for a continuous raf loop

* Apply formatting changes

* Create shadow-dom-unbusify.md

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Co-authored-by: eoghanmurray <[email protected]>

…ure (rrweb-io#1489)

* perf(mutation): add deep tree benchmark

* perf(mutation): use iterative procedure

* perf(mutation): run formatter

* perf(mutation): add changeset

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Merges upstream commits up to 609b7fa

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