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Drupal 8 में Z-इंडेक्स
When working with z-indexes (layers) in Drupal, developers may need to experiment to find out whether something they move up or down in the stack will cover or be covered by an element themed by a core module or theme. To save time figuring out what is happening at the layer level, the table below shows all instances of z-index in core. A module or theme with inheritance cells contains only a few entries if inheritance does not change the z-index value; otherwise, they receive a new row.
| z-index | Module/theme with inheritance | CSS selector(s) |
| 10000 | jquery-joyride/tour/stable | .joyride-expose-cover |
| 9999 | jquery-ui | .ui-tooltip |
| 1260 | jquery-dialog/dialog/classy | .ui-dialog |
| 1259 | jquery-dialog/dialog | ui-widget-overlay |
| 1250 | toolbar/stable | .toolbar .toolbar-bar | .toolbar .toolbar-tray |
| 1000 | system/stable | .ajax-progress-fullscreen |
| 1000 | jquery-ui/classy | .ui-dialog .ajax-progress-throbber |
| 1000 | bartik | body:not(:target) .region-primary-menu .menu-toggle |
| 1000 | simpletest/stable | a.simpletest-collapse:focus, hover |
| 502 | toolbar/stable | .toolbar-oriented .toolbar-bar |
| 502 | toolbar/stable | .toolbar .toolbar-bar .toolbar-tab > .toolbar-icon |
| 501 | toolbar/stable | .toolbar .toolbar-tray |
| 501 | settings-tray | .settings-tray |
| 500 | contextual | .contextual |
| 500 | contextual/stable | .contextual-links |
| 500 | system/stable | table.sticky-header |
| 499 | block/stable | .block-demo-backlink |
| 499 | node/bartik | .node-preview-container |
| 102 | jquery-joyride/tour/stable | .joyride-expose-wrapper |
| 101 | jquery-joyride/tour/stable | .joyride-tip-guide |
| 300 | quickedit/stabe | .quickedit-validation-errors |
| 300 | quickedit/stabe | .quickedit-form |
| 102 | jquery-joyride/tour/stable | .joyride-expose-wrapper |
| 101 | jquery-joyride/tour/stable | .joyride-tip-guide |
| 100 | quickedit/stable | .quickedit-toolbar-container |
| 100 | quickedit/stable | .quickedit-form-container |
| 100 | dropbutton/classy | .dropbutton-multiple.open |
| 100 | jquery-joyride/tour/stable | .joyride-modal-bg |
| 100 | jquery-ui | .ui-selectable-helper |
| 100 | jquery-ui | .ui-front |
| 99 | quickedit/stable | .quickedit-editable.quickedit-highlighted |
| 98 | quickedit/stable | .quickedit-editable |
| 51 | views/stable | .views-displays .tabs .open > a |
| 50 | views/stable | .views-displays .tabs .action-list |
| 50 | seven | .skip-link |
| 50 | bartik | .skip-link |
| 15 | seven | .tabs.primary .tabs__tab.is-active | .is-horizontal .tabs.secondary .tabs__tab |
| 11 | ckeditor/stable | ckeditor-buttons:hover + focus |
| 10 | ckeditor/stable | ckeditor-buttons |
| 10 | seven | .button:focus |
| 10 | ckeditor/seven | .cke_reset_all .cke_dialog_footer_buttons a.cke_dialog_ui_button:focus |
| 10 | seven | .is-collapse-enabled .tabs:before | .is-horizontal .tabs:before | .is-collapse-enabled .tabs__trigger |
| 5 | ckeditor | .cke_dialog_close |
| 3 | seven | .js .dropbutton-wrapper .dropbutton-widget .dropbutton-action a:hover, active, focus |
| 2 | views/stable | dropbutton |
| 2 | views/stable | .js .dropbutton-wrapper .dropbutton .dropbutton-action > .ajax-progress-throbber |
| 2 | seven | .vertical-tabs__menu-item focus active |
| 2 | contextual/stable | .contextual.open .trigger |
| 2 | jquery-ui | .ui-slider .ui-slider-handle |
| 2 | ckeditor | .cke_dialog_resizer |
| 2 | ckeditor | .cke_dialog_tabs |
| 1 | ckeditor/seven | .cke_dialog_body |
| 1 | seven | .vertical-tabs__menu-item.is-selected |
| 1 | jquery-ui | .ui-slider .ui-slider-range |
| -1 | ckeditor | .cke_dialog_ui_radio_input |
| -1 | ckeditor | .cke_iframe_shim |
| -1 | toolbar/stable | .toolbar-oriented .toolbar-tray-vertical > .toolbar-lining:before |
| -1 | quickedit/stable | #quickedit-toolbar-fence |