diff --git a/addons/web/static/src/core/tooltip/tooltip.scss b/addons/web/static/src/core/tooltip/tooltip.scss
index 98933b8ad56..faacce47bf4 100644
--- a/addons/web/static/src/core/tooltip/tooltip.scss
+++ b/addons/web/static/src/core/tooltip/tooltip.scss
@@ -1,5 +1,5 @@
 .o-tooltip {
-    font-size: smaller;
+    font-size: small;
 
     .o-tooltip--string {
         background-color: $o-tooltip-title-background-color;
@@ -8,18 +8,21 @@
     }
 
     .o-tooltip--help {
+        font-size: smaller;
         white-space: pre-line;
         padding: 8px;
         margin-bottom: 0px;
     }
 
     .o-tooltip--technical {
+        font-size: smaller;
         padding: 8px;
         margin: 0 0 0 15px;
         list-style-type: circle;
 
         .o-tooltip--technical--title {
             font-weight: bold;
+            margin-right: 4px;
         }
     }
 }
diff --git a/addons/web/static/src/core/tooltip/tooltip_service.js b/addons/web/static/src/core/tooltip/tooltip_service.js
index bc591385fc8..1aa80452a63 100644
--- a/addons/web/static/src/core/tooltip/tooltip_service.js
+++ b/addons/web/static/src/core/tooltip/tooltip_service.js
@@ -19,6 +19,9 @@ const { whenReady } = owl;
  * "data-tooltip-position":
  *   <button data-tooltip="This is a tooltip" data-tooltip-position="left">Do something</button>
  *
+ * The opening delay can be modified with the "data-tooltip-delay" attribute (default: 400):
+ *   <button data-tooltip="This is a tooltip" data-tooltip-delay="0">Do something</button>
+ *
  * For advanced tooltips containing dynamic and/or html content, the
  * "data-tooltip-template" and "data-tooltip-info" attributes can be used.
  * For example, let's suppose the following qweb template:
@@ -42,7 +45,6 @@ export const tooltipService = {
         let openTooltipTimeout;
         let closeTooltip;
         let target = null;
-
         let positionX;
         let positionY;
 
@@ -56,6 +58,29 @@ export const tooltipService = {
             }
         }
 
+        /**
+         * Checks that the target is in the DOM and we're hovering the target.
+         * @returns {boolean}
+         */
+        function shouldCleanup() {
+            if (!target) {
+                return;
+            }
+            if (!document.body.contains(target)) {
+                return cleanup(); // target is no longer in the DOM
+            }
+            const targetRect = target.getBoundingClientRect();
+            if (
+                positionX < targetRect.left ||
+                positionX > targetRect.right ||
+                positionY < targetRect.top ||
+                positionY > targetRect.bottom
+            ) {
+                return true; // mouse is no longer hovering the target
+            }
+            return false;
+        }
+
         /**
          * Opens the tooltip after a delay, if the event's target has a data-tooltip
          * attribute.
@@ -76,35 +101,39 @@ export const tooltipService = {
                 info = dataset.tooltipInfo ? JSON.parse(dataset.tooltipInfo) : null;
             }
             cleanup();
+            if (tooltip === "" && !template) {
+                return;
+            }
+
+            // register mouse position first in case the target
+            // contains disabled elements which would prevent
+            // to track mousemove. The position is needed to check
+            // whether the element is hovered or not
+            positionX = ev.x;
+            positionY = ev.y;
+
+            const delay = dataset.tooltipDelay ? JSON.parse(dataset.tooltipDelay) : OPEN_DELAY;
             openTooltipTimeout = browser.setTimeout(() => {
-                const position = dataset.tooltipPosition;
-                closeTooltip = popover.add(
-                    target,
-                    Tooltip,
-                    { tooltip, template, info },
-                    { position }
-                );
-            }, OPEN_DELAY);
+                if (shouldCleanup()) {
+                    cleanup();
+                } else {
+                    const position = dataset.tooltipPosition;
+                    closeTooltip = popover.add(
+                        target,
+                        Tooltip,
+                        { tooltip, template, info },
+                        { position }
+                    );
+                }
+            }, delay);
         }
 
         whenReady(() => {
             // Regularly check that the target is still in the DOM and we're still
             // hovering it, because if not, we have to close the tooltipd
             browser.setInterval(() => {
-                if (!target) {
-                    return;
-                }
-                if (!document.body.contains(target)) {
-                    return cleanup(); // target is no longer in the DOM
-                }
-                const targetRect = target.getBoundingClientRect();
-                if (
-                    positionX < targetRect.left ||
-                    positionX > targetRect.right ||
-                    positionY < targetRect.top ||
-                    positionY > targetRect.bottom
-                ) {
-                    return cleanup(); // mouse is no longer hovering the target
+                if (shouldCleanup()) {
+                    cleanup();
                 }
             }, CLOSE_DELAY);
 
diff --git a/addons/web/static/tests/core/tooltip/tooltip_service_tests.js b/addons/web/static/tests/core/tooltip/tooltip_service_tests.js
index 463d20084bd..247ce04c321 100644
--- a/addons/web/static/tests/core/tooltip/tooltip_service_tests.js
+++ b/addons/web/static/tests/core/tooltip/tooltip_service_tests.js
@@ -8,6 +8,7 @@ import { registry } from "@web/core/registry";
 import { clearRegistryWithCleanup, makeTestEnv } from "../../helpers/mock_env";
 import { getFixture, nextTick, patchWithCleanup, triggerEvent } from "../../helpers/utils";
 import { registerCleanup } from "../../helpers/cleanup";
+import { makeFakeLocalizationService } from "../../helpers/mock_services";
 
 const { App, Component, useState, xml } = owl;
 
@@ -28,7 +29,7 @@ const mainComponents = registry.category("main_components");
  * @param {{[templateName:string]: string}} [options.templates] additional templates
  * @returns {Promise<Component>}
  */
-async function makeParent(Child, options = {}) {
+export async function makeParent(Child, options = {}) {
     const target = getFixture();
 
     // add the popover service to the registry -> will add the PopoverContainer
@@ -44,6 +45,7 @@ async function makeParent(Child, options = {}) {
 
     registry.category("services").add("popover", popoverService);
     registry.category("services").add("tooltip", tooltipService);
+    registry.category("services").add("localization", makeFakeLocalizationService());
     const env = await makeTestEnv();
 
     patchWithCleanup(env.services.popover, {
@@ -341,4 +343,36 @@ QUnit.module("Tooltip service", (hooks) => {
             "<ul><li>X: 3</li><li>Y: abc</li></ul>"
         );
     });
+
+    QUnit.test("empty tooltip, no template", async (assert) => {
+        class MyComponent extends Component {
+            get tooltip() {
+                return "";
+            }
+        }
+        MyComponent.template = xml`<button t-att-data-tooltip="tooltip">Action</button>`;
+        let simulateTimeout = () => {};
+        const mockSetTimeout = (fn) => {
+            simulateTimeout = fn;
+        };
+        await makeParent(MyComponent, { mockSetTimeout });
+
+        assert.containsNone(target, ".o_popover_container .o_popover");
+        target.querySelector("button").dispatchEvent(new Event("mouseenter"));
+        await nextTick();
+        simulateTimeout();
+        await nextTick();
+        assert.containsNone(target, ".o_popover_container .o_popover");
+    });
+
+    QUnit.test("tooltip with a delay", async (assert) => {
+        class MyComponent extends Component {}
+        MyComponent.template = xml`<button data-tooltip="'helpful tooltip'" data-tooltip-delay="2000">Action</button>`;
+        const mockSetTimeout = (fn, delay) => {
+            assert.strictEqual(delay, 2000);
+        };
+        await makeParent(MyComponent, { mockSetTimeout });
+        target.querySelector("button").dispatchEvent(new Event("mouseenter"));
+        await nextTick();
+    });
 });