24d686ecfb
* Hygiene: clean up the xhtml namespace attribute; this is an artefact of the `serializeToString` method which we are using (I think) to be consistent with whitespace and to clean up invalid attributes. I'm removing as was confused as am adding tests related to doctypes * Record when a document is in `compatMode` and trigger this mode on the iframe upon replay https://developer.mozilla.org/en-US/docs/Web/API/Document/compatMode the included DOCTYPE was picked up from https://stackoverflow.com/questions/18976213/ - there may be better ways of triggering compatMode * Don't write an extra DOCTYPE if there's one already present in the snapshot. Rely instead on whatever doctype is there to trigger the BackCompat mode * Modify to write the correct doctype if we can sniff xhtml - don't have any evidence that this will make a difference * Dev convenience: Ignore files generated by editors * Typo fix * Was getting a 2000ms timeout on the 'before' hook I believe * Change certain tests to go directly to their localhost page instead of loading the html content programmatically in order to avoid triggering an incorrect BackCompat mode (incorrect in that the html content has a correct doctype) * Add test based on motivating site that had images lined up in a square which were all different sizes; very old style percentage width/height attributes were doing the right thing in quirksmode, which is what we are testing for here * Fixup rrweb test html to include a valid doctype and avoid BackCompat to ensure we're not accidentally testing against quirks modes. I didn't find an elegant way of avoiding the `BackCompat` when adding a minimal iframe, so some BackCompat has slipped in here, I don't think there's much harm
rrweb-snapshot
Snapshot the DOM into a stateful and serializable data structure. Also, provide the ability to rebuild the DOM via snapshot.
API
This module export following methods:
snapshot
snapshot will traverse the DOM and return a stateful and serializable data structure which can represent the current DOM view.
There are several things will be done during snapshot:
- Inline some DOM states into HTML attributes, e.g, HTMLInputElement's value.
- Turn script tags into
noscripttags to avoid scripts being executed. - Try to inline stylesheets to make sure local stylesheets can be used.
- Make relative paths in href, src, CSS to be absolute paths.
- Give an id to each Node, and return the id node map when snapshot finished.
rebuild
rebuild will build the DOM according to the taken snapshot.
There are several things will be done during rebuild:
- Add data-rrid attribute if the Node is an Element.
- Create some extra DOM node like text node to place inline CSS and some states.
- Add data-extra-child-index attribute if Node has some extra child DOM.
serializeNodeWithId
serializeNodeWithId can serialize a node into snapshot format with id.
buildNodeWithSN
buildNodeWithSN will build DOM from serialized node and store serialized information in __sn property.