| # Metrics for Understanding Browser Resize Behaviour |
| ## Motivation |
| Providing a smooth experience during an interactive resize of a browser window |
| is remarkably difficult. Each resize operation involves the browser process |
| (which receives the event), the renderer process (which needs to update the |
| page, relayout etc.), and the gpu process (which updates the content on |
| screen). There are various trade-offs made in this process to make the |
| user-experience better. Having some data to model the resize-behaviour of users |
| can help us improve the various heuristics we make, and fine-tune them to |
| improve the user experience. It also makes it easier to write tests to match |
| the user behaviour and watch for regressions/improvements etc. |
| |
| ## Possible Improvements in Chrome |
| * The amount of gutter allowed can be adjusted. |
| * If user is doing quick-drags to resize, then perhaps the amount of gutter is |
| the wrong metric to optimize for. |
| * Maybe some different UX? For example, scale the content instead of |
| live-updates for small incremental changes if we can tell with high confidence |
| that more resize events are on the way, etc. |
| https://crbug.com/837247 |
| |
| --- |
| ## BrowserWindow.Resize.Duration |
| * units: milliseconds |
| * owners: sadrul@chromium.org, mustash-team@google.com |
| * added: 2018-01-01 |
| * expires: 2018-08-31 |
| * os: windows |
| * tags: input, interactive |
| |
| Duration of an interactive resize from start to end. Measured only on Windows. |
| |
| --- |
| ## BrowserWindow.Resize.StepBoundsChange |
| * units: pixels |
| * owners: sadrul@chromium.org |
| * added: 2018-01-01 |
| * expires: 2018-08-31 |
| * os: windows |
| * tags: input, interactive |
| |
| Size changed between two consecutive steps during browser-window resize. |
| Measured only on Windows. |
| |
| --- |
| ## BrowserWindow.Resize.StepCount |
| * units: steps |
| * owners: sadrul@chromium.org |
| * added: 2018-01-01 |
| * expires: 2018-08-31 |
| * os: windows |
| * tags: input, interactive |
| |
| Number of intermediate resize-steps taken to complete the resize from start to |
| end. Measured only on Windows. |
| |
| --- |
| ## BrowserWindow.Resize.StepInterval |
| * units: milliseconds |
| * owners: sadrul@chromium.org |
| * added: 2018-01-01 |
| * expires: 2018-08-31 |
| * os: windows |
| * tags: input, interactive |
| |
| Time-interval between two consecutive steps during browser-window resize. An |
| interactive resize can have many number of small steps. This measures the |
| interval between two steps. 'Duration' measures the interval between the first |
| and last steps. Note that a high interval is not necessarily bad (e.g. a user |
| could pause in the middle of the resize). Measured only on Windows. |
| |
| --- |
