Sylvestre Ledru
8f033c8241
Convert testing/{awsy,condprofile,docs,geckodriver,marionette,
mozbase,mozharness,perfdocs,performance,raptor,talos,web-platform}
RST documentation files to MyST-flavored Markdown.
Skips testing/perfdocs/generated/* (auto-generated by mach perfdocs)
and testing/web-platform/tests/* (third-party test trees).
- Move treeherder-try frontmatter substitutions under the new myst
topmatter key.
- Allow the pre-existing autodoc Unknown target warning for
mozprofile.permissions to keep the build clean.
- Refresh allowed-warnings glob for manifest-sandbox download from
.rst to .md.
Differential Revision: https://phabricator.services.mozilla.com/D304228
40 lines
1.4 KiB
Markdown
40 lines
1.4 KiB
Markdown
# Debugging
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```{eval-rst}
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.. py:currentmodule:: marionette_driver.marionette
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```
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Sometimes when working with Marionette you'll run into unexpected behaviour and
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need to do some debugging. This page outlines some of the Marionette methods
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that can be useful to you.
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Please note that the best tools for debugging are the [ones that ship with
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Gecko][ones that ship with gecko]. This page doesn't describe how to use those with Marionette. Also see
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a related topic about [using the debugger with Marionette] on MDN.
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## Seeing What's on the Page
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Sometimes it's difficult to tell what is actually on the page that is being
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manipulated. Either because it happens too fast, the window isn't big enough or
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you are manipulating a remote server! There are two methods that can help you
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out. The first is {func}`~Marionette.screenshot`:
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```
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marionette.screenshot() # takes screenshot of entire frame
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elem = marionette.find_element(By.ID, 'some-div')
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marionette.screenshot(elem) # takes a screenshot of only the given element
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```
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Sometimes you just want to see the DOM layout. You can do this with the
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{attr}`~Marionette.page_source` property. Note that the page source depends on
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the context you are in:
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```
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print(marionette.page_source)
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marionette.set_context('chrome')
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print(marionette.page_source)
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```
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[ones that ship with gecko]: https://developer.mozilla.org/en-US/docs/Tools
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[using the debugger with marionette]: https://developer.mozilla.org/en-US/docs/Marionette/Debugging
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