This change ensure's the HAR file is saved at `recordHar.path` on the
client instead of the server.
NB: The goal was to make this change transparent to the user and NOT
introduce any new APIs. Namely, I want to leave the API open for
potential `context.har.start()` and `context.har.stop()`.
This does BREAK servers that expect the HAR to be at the `recordHar.path`
on the server, but I think that's OK since there haven't been reports
of missing HAR on client making me think not many users are getting
HAR with client and server on different hosts anyways.
Closes#8355
Strict doesn't make sense in querySelectorAll, but it was in the protocol.
And we had a strict option in ElementHandle.waitForSelector but it
was not surfaced in the docs/api.
Without this, Playwright's CDP feature leaves unreachable
targets (namely OOPIFs).
This change allows for more advanced experimentation in user-land
without relying on out-of-band CDP connections and clients.
Now you can, for example, call `DOM.getDocument` on the
page OR main frame, observe there is an iframe node with
no `contentDocument` (i.e. OOPIF), make note of the referenced
`frameId`, and then iterate of page.frames() calling `Target.getInfo`
on each to link the Playwright Frame with the CDP `frameId` and
then recurse.
Relates #8113
Subsequent invocations reset the trace. This removes the `tracing._reset` method.
Also fixed a bug where BASE element was not reset properly.
Also fixed a bug where tracing would affect the result of protocol call
by setting `callMetadata.error` property.
`tracing._export({ path })` exports current tracing state into a file
and does not require tracing to be stopped.
`tracing._reset()` resets current tracing state, but keeps resources
around so they can be referenced in the future snapshots. Does not stop.
The usage pattern is:
```js
await tracing.start({ screenshots: true, snapshots: true });
// ...
await tracing._reset();
// Do stuff, it will all be in the export below.
await tracing._export({ path });
// ...
await tracing.stop();
```
