1====
2Tips
3====
4
5General
6*******
7
8Screenshots:
9
10.. |image1| image:: screenshot_button.png
11  :alt: Button to take screenshots of the entire page
12  :width: 20
13
14- Entire page: Click the screenshot button (|image1| :ref:`needs to be enabled <tools-toolbox-extra-tools>` first).
15- Viewport: Click the screenshot button (|image1|) in :ref:`Responsive Design Mode <responsive-design-mode-camera-button>`.
16- Node: Right-click a node within the Inspector and click :ref:`"Screenshot Node" <taking-screenshots-of-an-element>`.
17- Via :doc:`Web Console command <../web_console/helpers/index>`: ``screenshot <filename.png> --fullpage``.
18
19
20Settings:
21
22- Choose between a :ref:`light and a dark theme <settings-themes>` for the developer tools.
23- :ref:`Change the keyboard bindings <settings-editor-preferences>` to Vim, Emacs or Sublime Text if you're used to different shortcuts.
24- Check or uncheck the different tools to enable or disable them. (There are more than the default tools!)
25
26
27Page Inspector
28**************
29
30In the :ref:`markup view <page_inspector_ui_tour_html_pane>`:
31
32
33- Press :kbd:`H` with a node selected to hide/show it.
34- Press :kbd:`Backspace` or :kbd:`Del` with a node selected to delete it.
35- :kbd:`Alt` + click on a node to expand or collapse it and all its descendants.
36- Click on the last :ref:`breadcrumb button <page-inspector-how-to-examine-and-edit-html-breadcrumbs>` to scroll the selection into view in the inspector.
37- Click the "ev" icon besides a node to :doc:`see all event listeners attached to it <../page_inspector/examine_event_listeners/index>`.
38- Press :kbd:`S` with a node selected to see it in the page (same as right-click a node and click :ref:`Scroll Into View <page_inspector_how_to_examine_and_edit_scroll_into_view>`).
39- Right-click a node and click :ref:`Use in Console<page_inspector_how_to_examine_and_edit_html_use_in_console>` to :doc:`command line <../web_console/the_command_line_interpreter/index>` as ``tempN`` variable.
40
41
42When :ref:`selecting elements <page_inspector_select_element_button>`:
43
44
45- :kbd:`Shift` + click to select an element but keep selecting (picker mode doesn't disengage).
46- Use :kbd:`←`/:kbd:`→` to navigate to parents/children elements (if they're hard to select).
47
48
49In the :ref:`rules view <page_inspector_ui_tour_rules_view>`:
50
51.. |image2| image:: picker.png
52  :width: 20
53
54.. |image3| image:: filter.png
55  :width: 20
56
57- Click the inspector icon |image2| next to any selector to highlight all elements that match it.
58- Click the inspector icon |image2| next to the ``element{}`` rule to lock the highlighter on the current element.
59- Right-click any property and select "Show MDN Docs" to view the MDN docs for this property.
60- Click on the filter icon |image3| next to an overridden property to :ref:`find which other property overrides it <page-inspector-how-to-examine-and-edit-css-overridden-declarations>`.
61- Right-click on a name, value, or rule to copy anything from the name, the value, the declaration or the whole rule to your clipboard.
62
63
64Web Console
65***********
66
67In all panels:
68
69- :kbd:`Esc` opens the :doc:`split console <../web_console/split_console/index>`; useful when debugging, or inspecting nodes
70
71
72In the :doc:`command line <../web_console/the_command_line_interpreter/index>`:
73
74
75- :ref:`$0 <web_console_helpers_$0>` references the currently selected node.
76- :ref:`$() <web_console_helpers_$>` is a shortcut to `document.querySelector() <https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector>`_
77- :ref:`$$() <web_console_helpers_$$>` returns an array with the results from `document.querySelector() <https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector>`_.
78- :ref:`copy <web_console_helpers_copy>` copies anything as a string.
79- Right-click a node in the Inspector and click :ref:`Use in Console <page_inspector_how_to_examine_and_edit_html_use_in_console>` to create a :ref:`temp*N* <web_console_helpers_tempn>` variable for it.
80- `console.table() <https://developer.mozilla.org/en-US/docs/Web/API/console/table>`_ displays tabular data as table.
81- :ref:`help <web_console_helpers_help>` opens the MDN page describing the available commands.
82- ``:screenshot <filename.png> --fullpage`` saves a screenshot to your downloads directory using the optional file name. If no filename is included, the file name will be in this format:
83
84.. code-block::
85
86  Screen Shot date at time.png
87
88The ``--fullpage`` parameter is optional. If you include it, the screenshot will be of the whole page, not just the section visible in the browser windows. The file name will have ``-fullpage`` appended to it as well. See :doc:`Web Console Helpers <../web_console/helpers/index>` for all parameters.
89
90
91In the console output:
92
93
94- Click on the inspector icon |image2| next to an element in the output to :ref:`select it within the Inspector <web_console_rich_output_highlighting_and_inspecting_dom_nodes>`.
95- Check :ref:`"Enable persistent logs" <settings-common-preferences>` in the settings to keep logged messages from before even after navigation.
96- Check :ref:`"Enable timestamps" <settings-web-console>` in the settings to show timestamps besides the logged messages.
97
98
99Debugger
100********
101
102.. |image4| image:: black_boxing.png
103  :width: 20
104
105
106- Skip JavaScript libraries in debugging sessions via the black box icon |image4|.
107- Press :kbd:`Ctrl` + :kbd:`Alt` + :kbd:`F` to search in all scripts.
108- Press :kbd:`Ctrl` + :kbd:`D` to search for a function definition.
109- Press :kbd:`Ctrl` + :kbd:`L` to go to a specific line.
110
111
112Style Editor
113************
114
115.. |image5| image:: import_button.png
116  :alt: Button to import a style sheet from the file system
117  :width: 20
118
119.. |image6| image:: create_style_sheet_button.png
120  :alt: Button to create a new style sheet
121  :width: 20
122
123- The black box icon |image4| in the style sheet pane toggles the visibility of a style sheet.
124- Click an :ref:`@media rule <style-editor-the-media-sidebar>` to apply it in :doc:`Responsive Design Mode <../responsive_design_mode/index>`.
125- Click the import button |image5| to import a style sheet or the create button |image6| to create a new one.
126- Click the options button in the :ref:`style sheet pane <style-editor-the-style-sheet-pane>` and click :ref:`"Show original sources" <style-editor-source-map-support>` to toggle the display of CSS preprocessor files.
127
128
129Network Monitor
130***************
131
132- Click the request summary to :doc:`compare performance of cache vs. no-cache page loading <../network_monitor/performance_analysis/index>`.
133- When a request is selected click :ref:`"Edit and Resend" <network-monitor-request-list-edit-and-resend>` to modify its headers and send it again.
134- Check :ref:`"enable persistent logs" <settings-common-preferences>` in the settings to keep requests from before even after navigation.
135- Hover the :ref:`"js" icon within the "Cause" column <request-list-requst-list-cause-column>` to see the JavaScript stack trace, which caused the request.
136- Check :ref:`"Disable HTTP Cache (when toolbox is open)" <settings_advanced_settings>` in the settings to disable the network cache while debugging network issues.
137
138
139Storage Inspector
140*****************
141
142- Right-click the column headers to open a menu allowing to toggle the display of the columns.
143- Right-click an entry and click "Delete *name*" to delete it or "Delete All" to delete all entries.
144- Select an entry to see the parsed value of it in the sidebar.
145