7 files declare their use of WebformElementBrowserTestBase in Webform 6.x

WebformElementButtonsTest.php in modules/webform_jqueryui_buttons/tests/src/Functional/WebformElementButtonsTest.php

WebformIcheckElementTest.php in modules/webform_icheck/tests/src/Functional/WebformIcheckElementTest.php

WebformImageSelectElementImagesTest.php in modules/webform_image_select/tests/src/Functional/WebformImageSelectElementImagesTest.php

WebformImageSelectElementTest.php in modules/webform_image_select/tests/src/Functional/WebformImageSelectElementTest.php

WebformImageSelectImagesTest.php in modules/webform_image_select/tests/src/Functional/WebformImageSelectImagesTest.php

WebformLocationGeocompleteTest.php in modules/webform_location_geocomplete/tests/src/Functional/WebformLocationGeocompleteTest.php

WebformTogglesElementTest.php in modules/webform_toggles/tests/src/Functional/WebformTogglesElementTest.php