Note: this list is generated by looking for the string for this theme hook, so it may include some references that are not actually using this theme hook.

ajax_pre_render_element in core/includes/ajax.inc
Adds Ajax information about an element to communicate with JavaScript.
backdrop_common_theme in core/includes/common.inc
Provides theme registration for themes across .inc files.
block_admin_configure in core/modules/block/block.admin.inc
Form constructor for the block configuration form.
CommonBackdropRenderTestCase::testBackdropRenderFormElements in core/modules/simpletest/tests/common.test
Test rendering form elements without passing through form_builder().
config_diff_page in core/modules/config/config.admin.inc
Shows diff of specified configuration file.
file_managed_file_browser_form in core/modules/file/file.module
Form to submit a file selected in the file browser.
filter_admin_format_filter_settings_form in core/modules/filter/filter.admin.inc
Returns the configuration form for an individual configurable filter.
FormsTestCase::testDisabledMarkup in core/modules/simpletest/tests/form.test
Verify markup for disabled form elements.
form_process_actions in core/includes/form.inc
Processes a form actions container element.
form_test_clicked_button in core/modules/simpletest/tests/form_test.module
Form builder to test button click detection.
form_test_form_state_values_clean_form in core/modules/simpletest/tests/form_test.module
Form builder for form_state_values_clean() test.
form_test_load_include_custom in core/modules/simpletest/tests/form_test.module
Menu callback for testing custom form includes.
form_test_load_include_menu in core/modules/simpletest/tests/form_test.file.inc
Form constructor for testing FAPI file inclusion of the file specified in hook_menu().
form_test_storage_form in core/modules/simpletest/tests/form_test.module
A multistep form for testing the form storage.
layout_content_form in core/modules/layout/layout.admin.inc
Form callback; Main form for editing a layout's content.
node_form in core/modules/node/node.pages.inc
Form constructor for the node add/edit form.
system_element_info in core/modules/system/system.module
Implements hook_element_info().
system_jump_menu in core/modules/system/system.module
Generate a jump menu form.
system_modules in core/modules/system/system.admin.inc
Menu callback; provides module enable/disable interface.
template_preprocess_views_exposed_form in core/modules/views/templates/views.theme.inc
Default theme function for all filter forms.
theme_submit in core/includes/form.inc
Returns HTML for a submit button form element.
theme_update_last_check in core/modules/update/update.theme.inc
Returns HTML for the last time we checked for update data.
views_handler_filter::show_build_group_button in core/modules/views/handlers/views_handler_filter.inc
Shortcut to display the build_group/hide button.
views_handler_filter::show_expose_button in core/modules/views/handlers/views_handler_filter.inc
Shortcut to display the expose/hide button.
views_handler_sort::show_expose_button in core/modules/views/handlers/views_handler_sort.inc
Shortcut to display the expose/hide button.
views_plugin_display::options_form in core/modules/views/plugins/views_plugin_display.inc
Provide the default form for setting options.
views_plugin_style_jump_menu::render in core/modules/views/plugins/views_plugin_style_jump_menu.inc
Render the display in this style.
views_plugin_style_summary_jump_menu::render in core/modules/views/plugins/views_plugin_style_summary_jump_menu.inc
Render the display in this style.
views_ui_preview_form in core/modules/views_ui/views_ui.admin.inc
Provide the preview formulas and the preview output, too.
_form_test_disabled_elements in core/modules/simpletest/tests/form_test.module
Build a form to test disabled elements.
_form_test_disabled_elements in core/modules/simpletest/tests/form_test.module
Build a form to test disabled elements.