3 Marionette uses a small list of [Selenium atoms] to interact with
4 web elements. Initially those have been added to ensure a better
5 reliability due to a wider usage inside the Selenium project. But
6 by adding full support for the [WebDriver specification] they will
7 be removed step by step.
9 Currently the following atoms are in use:
12 - `isElementDisplayed`
15 To use one of those atoms Javascript modules will have to import
18 [Selenium atoms]: https://github.com/SeleniumHQ/selenium/tree/master/javascript/webdriver/atoms
19 [WebDriver specification]: https://w3c.github.io/webdriver/webdriver-spec.html
20 [atom.sys.mjs]: https://searchfox.org/mozilla-central/source/remote/marionette/atom.sys.mjs
22 ## Update required Selenium atoms
24 In regular intervals the atoms, which are still in use, have to
25 be updated. Therefore they have to be exported from the Selenium
26 repository first, and then updated in [atom.sys.mjs].
28 ### Export Selenium Atoms
30 The canonical GitHub repository for Selenium is
32 <https://github.com/SeleniumHQ/selenium.git>
34 so make sure to have an up-to-date local copy of it. If you have to clone
35 it first, it is recommended to specify the `--depth=1` argument, so only the
36 last changeset is getting downloaded (which itself might already be
40 git clone --depth=1 https://github.com/SeleniumHQ/selenium.git
43 To export the correct version of the atoms identify the changeset id (SHA1) of
44 the Selenium repository in the [index section] of the WebDriver specification.
46 Fetch that changeset and check it out:
49 git fetch --depth=1 origin SHA1
53 Now you can export all the required atoms by running the following
54 commands. Make sure to [install bazelisk] first.
57 bazel build //javascript/atoms/fragments:get-text
58 bazel build //javascript/atoms/fragments:is-displayed
59 bazel build //javascript/atoms/fragments:is-enabled
62 For each of the exported atoms a file can now be found in the folder
63 `bazel-bin/javascript/atoms/fragments/`. They contain all the
64 code including dependencies for the atom wrapped into a single function.
66 [index section]: <https://w3c.github.io/webdriver/#index>
67 [install bazelisk]: <https://github.com/bazelbuild/bazelisk#installation>
69 ### Update atom.sys.mjs
71 To update the atoms for Marionette the `atoms.js` file has to be edited. For
72 each atom to be updated the steps as laid out below have to be performed:
74 1. Open the Javascript file of the exported atom. See above for
77 2. Remove the contained license header, which can be found somewhere
78 in the middle of the file.
80 3. Update the parameters of the wrapper function (at the very top)
81 so that those are equal with the used parameters in `atom.sys.mjs`.
83 4. Copy the whole content of the file, and replace the existing
84 code for the atom in `atom.sys.mjs`.
88 To ensure that the update of the atoms doesn't cause a regression
89 a try build should be run including Marionette unit tests, Firefox
90 ui tests, and all the web-platform-tests.