This fix restores the ability to display images in the Network Tab inside Trace Viewer. Previously data returned from the server was coming back as base64 encoded string, but now it is returned as a Buffer object. This required convertion to either base64 encoded string or utf8 encoded string on the frontend.
Co-authored-by: Dominik Deren <dominik.deren@live.com>
Everything but attributes in the light dom is manually compared during
DOM traversal, for example child nodes or scroll offset.
This way we get a bullet-proof solution that works with input values,
scroll offsets, shadow dom and anything else web comes up with.
We also restore scroll only on the document scrolling element, for
performance reasons. We should figure out the story around scrolling.
Changes stationary snapshots from ~0.5ms to ~2.5ms due to DOM traversal.
- Intercept CSSOM modifications and recalculate overridden css text.
- When css text does not change, use "backwards reference" similar
to node references.
- Set 'Cache-Control: no-cache' for resources that could be overridden.
- Switch from html to json ml format.
- Allow node reuse between snapshots with `[nSnapshotsBefore, nodeWithIndexM]`.
- Service worker now lazily serializes snapshot chunks into a single html.
This decreases total snapshot size on random scripts ~10x.
This also decreases snapshot collecting time on mostly static pages to ~0.3ms.
Unfortunate downside for now is that we have to intercept
`Element.prototype.attachShadow` to invalidate nodes. This
also temporary breaks scroll restoration. Needs more research.
- Move service worker under /snapshot/ instead of /.
- Fix stylesheet base uri bug, where we inherited the wrong base url.
- Introduce TraceServer and routes there, split the actual routes
between snapshot, ui and action previews.
This change is adding a new property on the BrowserContextOptions class called `_debugName`. This property allows defining a user-friendly name for the browser context, and currently it is being used in one place, the Trace Viewer. When user provides the new value in the following way:
```typescript
const { chromium } = require('playwright');
(async () => {
const browser = await chromium.launch();
const context = await browser.newContext({ _traceDir: __dirname, _debugName: 'My custom testcase name' });
await context.close();
await browser.close();
})();
```
The `_debugName` will be saved in the `*.trace` file for this browser context, on the `context-created` event, under the key `debugName`.
Later, when such a trace is displayed using Trace Viewer, the `debugName` will be displayed in the dropdown in the top right part of the app instead of the actual trace filename.
Fixes#5157.
Installer has a code to download browsers from the old version of
playwright. This, however, is never needed, since installer only
installs browsers from its own version.
This introduces an http server that serves our frontend and our snapshots. There is more work to untangle the big server into a few modules.
This change allows us:
- Maybe eventually serve the trace viewer as a web page.
- Rely on browser caches for fast snapshot rendering. This PR also adds "snapshot on hover" feature, subject to change.
