1987605 - Clarify behavior of "isMobile" argument of "browsingContext.setViewport" command on the spec level and check RDM implementation

Status: RESOLVED FIXED

(Remote Protocol :: WebDriver BiDi, task, P2)

Description

[Alexandra Borovova [:Sasha]]

In order to implement "isMobile" argument of "browsingContext.setViewport" command, which should mimic "mobile" argument in CDP "Emulation.setDeviceMetricsOverride" command, we have to clarify first what is the expected behavior to write the specification of it and evaluate if some parts of RDM implementation might be reused here.

Comment 1

[Alexandra Borovova [:Sasha]]

What I could find out about requirements in Emulation.setDeviceMetricsOverride :

• apply viewport meta tag - supported by RDM;
• use overlay scrollbar - supported by RDM;
• text autosizing - is not supported by Firefox;
• reset zoom - looks like it's also supported by RDM;
• aligning viewport dimensions with the widget, probably is not required for BiDi.

Playwright seems to be expecting for their isMobile to only require:

• touch to be enabled (already extracted in the separate property);
• viewport meta tags to be applied;
• overlay scrollbars.

Comment 2

[Alexandra Borovova [:Sasha]]

The future work will be split into separate APIs for touch, viewport meta tags and overlay scrollbars.