diff --git a/HISTORY.md b/HISTORY.md
index eccff1b..f38859b 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -5,6 +5,7 @@ https://github.com/josdejong/jsoneditor
 
 ## not yet published, version 7.0.4
 
+- Fixed #723: schema error popup not always fully visible.
 - Fixed wrong text color in search box when using JSONEditor in combination
   with bootstrap. See #791. Thanks @dmitry-kulikov.
 - Fixed react examples not working out of the box when cloning or downloading
diff --git a/src/js/Node.js b/src/js/Node.js
index 2b07fba..1db0a25 100644
--- a/src/js/Node.js
+++ b/src/js/Node.js
@@ -288,32 +288,49 @@ export class Node {
         this.dom.tdValue.parentNode.appendChild(tdError)
       }
 
-      const popover = document.createElement('div')
-      popover.className = 'jsoneditor-popover jsoneditor-right'
-      popover.appendChild(document.createTextNode(error.message))
-
       const button = document.createElement('button')
       button.type = 'button'
       button.className = 'jsoneditor-button jsoneditor-schema-error'
-      button.appendChild(popover)
 
-      // update the direction of the popover
-      button.onmouseover = button.onfocus = function updateDirection () {
-        const directions = ['right', 'above', 'below', 'left']
-        for (let i = 0; i < directions.length; i++) {
-          const direction = directions[i]
-          popover.className = 'jsoneditor-popover jsoneditor-' + direction
-
-          const contentRect = this.editor.content.getBoundingClientRect()
-          const popoverRect = popover.getBoundingClientRect()
-          const margin = 20 // account for a scroll bar
-          const fit = insideRect(contentRect, popoverRect, margin)
-
-          if (fit) {
-            break
-          }
+      const destroy = () => {
+        if (this.dom.popupAnchor) {
+          this.dom.popupAnchor.destroy() // this will trigger the onDestroy callback
         }
-      }.bind(this)
+      }
+
+      const onDestroy = () => {
+        delete this.dom.popupAnchor
+      }
+
+      const createPopup = (destroyOnMouseOut) => {
+        const frame = this.editor.frame
+        this.dom.popupAnchor = createAbsoluteAnchor(button, frame, onDestroy, destroyOnMouseOut)
+
+        const popupWidth = 200; // must correspond to what's configured in the CSS
+        const buttonRect = button.getBoundingClientRect()
+        const frameRect = frame.getBoundingClientRect()
+        const position = (frameRect.width - buttonRect.x > (popupWidth / 2 + 20))
+          ? 'jsoneditor-above'
+          : 'jsoneditor-left'
+
+        const popover = document.createElement('div')
+        popover.className = 'jsoneditor-popover ' + position
+        popover.appendChild(document.createTextNode(error.message))
+        this.dom.popupAnchor.appendChild(popover)
+      }
+
+      button.onmouseover = () => {
+        if (!this.dom.popupAnchor) {
+          createPopup(true)
+        }
+      }
+      button.onfocus = () => {
+        destroy()
+        createPopup(false)
+      }
+      button.onblur = () => {
+        destroy()
+      }
 
       // when clicking the error icon, expand all nodes towards the invalid
       // child node, and set focus to the child node
@@ -861,6 +878,11 @@ export class Node {
     if (table) {
       table.removeChild(tr)
     }
+
+    if (this.dom.popupAnchor) {
+      this.dom.popupAnchor.destroy()
+    }
+
     this.hideChilds(options)
   }
 
diff --git a/src/js/createAbsoluteAnchor.js b/src/js/createAbsoluteAnchor.js
index 6ce516b..a6ec62d 100644
--- a/src/js/createAbsoluteAnchor.js
+++ b/src/js/createAbsoluteAnchor.js
@@ -5,10 +5,11 @@ import { isChildOf, removeEventListener, addEventListener } from './util'
  * element.
  * @param {HTMLElement} anchor
  * @param {HTMLElement} parent
- * @param [onDestroy(function(anchor)]  Callback when the anchor is destroyed
+ * @param {function(HTMLElement)} [onDestroy]  Callback when the anchor is destroyed
+ * @param {boolean} [destroyOnMouseOut=false] If true, anchor will be removed on mouse out
  * @returns {HTMLElement}
  */
-export function createAbsoluteAnchor (anchor, parent, onDestroy) {
+export function createAbsoluteAnchor (anchor, parent, onDestroy, destroyOnMouseOut = false) {
   const root = getRootNode(anchor)
   const eventListeners = {}
 
@@ -48,17 +49,34 @@ export function createAbsoluteAnchor (anchor, parent, onDestroy) {
     }
   }
 
+  function isOutside (target) {
+    return (target !== absoluteAnchor) && !isChildOf(target, absoluteAnchor)
+  }
+
   // create and attach event listeners
-  const destroyIfOutside = event => {
-    const target = event.target
-    if ((target !== absoluteAnchor) && !isChildOf(target, absoluteAnchor)) {
+  function destroyIfOutside (event) {
+    if (isOutside(event.target)) {
       destroy()
     }
   }
 
   eventListeners.mousedown = addEventListener(root, 'mousedown', destroyIfOutside)
   eventListeners.mousewheel = addEventListener(root, 'mousewheel', destroyIfOutside)
-  // eventListeners.scroll = addEventListener(root, 'scroll', destroyIfOutside);
+
+  if (destroyOnMouseOut) {
+    let destroyTimer = null
+
+    absoluteAnchor.onmouseover = () => {
+      clearTimeout(destroyTimer)
+      destroyTimer = null
+    }
+
+    absoluteAnchor.onmouseout = () => {
+      if (!destroyTimer) {
+        destroyTimer = setTimeout(destroy, 200)
+      }
+    }
+  }
 
   absoluteAnchor.destroy = destroy
 
diff --git a/src/scss/jsoneditor.scss b/src/scss/jsoneditor.scss
index 616695b..3fa70c6 100644
--- a/src/scss/jsoneditor.scss
+++ b/src/scss/jsoneditor.scss
@@ -82,6 +82,8 @@ div {
     }
     div {
       &.jsoneditor-anchor {
+        cursor: pointer;
+
         .picker_wrapper {
           &.popup {
             &.popup_bottom {
@@ -370,12 +372,14 @@ div.jsoneditor-value,
 div.jsoneditor td,
 div.jsoneditor th,
 div.jsoneditor textarea,
-div.jsoneditor pre.jsoneditor-preview,
-div.jsoneditor .jsoneditor-schema-error {
+pre.jsoneditor-preview,
+.jsoneditor-schema-error,
+.jsoneditor-popover{
   font-family: $jse-font-mono;
   font-size:  $jse-font-size;
   color: $jse-content-color;
 }
+
 .jsoneditor-schema-error {
   cursor: default;
   display: inline-block;
@@ -384,74 +388,76 @@ div.jsoneditor .jsoneditor-schema-error {
   position: relative;
   text-align: center;
   width: 24px;
-  .jsoneditor-popover {
-    background-color: $jse-popover-bg;
-    border-radius: 3px;
-    box-shadow: $jse-box-shadow-sm;
-    color: $jse-white;
-    display: none;
-    padding: 7px 10px;
-    position: absolute;
-    width: 200px;
-    z-index: 4;
-    &.jsoneditor-above {
-      bottom: 32px;
-      left: -98px;
-      &:before {
-        border-top: 7px solid $jse-popover-bg;
-        bottom: -7px;
-      }
-    }
-    &.jsoneditor-below {
-      top: 32px;
-      left: -98px;
-      &:before {
-        border-bottom: 7px solid $jse-popover-bg;
-        top: -7px;
-      }
-    }
-    &.jsoneditor-left {
-      top: -7px;
-      right: 32px;
-      &:before {
-        border-left: 7px solid $jse-popover-bg;
-        border-top: 7px solid transparent;
-        border-bottom: 7px solid transparent;
-        content: "";
-        top: 19px;
-        right: -14px;
-        left: inherit;
-        margin-left: inherit;
-        margin-top: -7px;
-        position: absolute;
-      }
-    }
-    &.jsoneditor-right {
-      top: -7px;
-      left: 32px;
-      &:before {
-        border-right: 7px solid $jse-popover-bg;
-        border-top: 7px solid transparent;
-        border-bottom: 7px solid transparent;
-        content: "";
-        top: 19px;
-        left: -14px;
-        margin-left: inherit;
-        margin-top: -7px;
-        position: absolute;
-      }
-    }
+}
+
+.jsoneditor-popover {
+  background-color: $jse-popover-bg;
+  border-radius: 3px;
+  box-shadow: $jse-box-shadow-sm;
+  color: $jse-white;
+  padding: 7px 10px;
+  position: absolute;
+  cursor: auto;
+  width: 200px;
+  z-index: 999;
+  &.jsoneditor-above {
+    bottom: 32px;
+    left: -98px;
     &:before {
-      border-right: 7px solid transparent;
-      border-left: 7px solid transparent;
+      border-top: 7px solid $jse-popover-bg;
+      bottom: -7px;
+    }
+  }
+  &.jsoneditor-below {
+    top: 32px;
+    left: -98px;
+    &:before {
+      border-bottom: 7px solid $jse-popover-bg;
+      top: -7px;
+    }
+  }
+  &.jsoneditor-left {
+    top: -7px;
+    right: 32px;
+    &:before {
+      border-left: 7px solid $jse-popover-bg;
+      border-top: 7px solid transparent;
+      border-bottom: 7px solid transparent;
       content: "";
-      display: block;
-      left: 50%;
-      margin-left: -7px;
+      top: 19px;
+      right: -14px;
+      left: inherit;
+      margin-left: inherit;
+      margin-top: -7px;
       position: absolute;
     }
   }
+  &.jsoneditor-right {
+    top: -7px;
+    left: 32px;
+    &:before {
+      border-right: 7px solid $jse-popover-bg;
+      border-top: 7px solid transparent;
+      border-bottom: 7px solid transparent;
+      content: "";
+      top: 19px;
+      left: -14px;
+      margin-left: inherit;
+      margin-top: -7px;
+      position: absolute;
+    }
+  }
+  &:before {
+    border-right: 7px solid transparent;
+    border-left: 7px solid transparent;
+    content: "";
+    display: block;
+    left: 50%;
+    margin-left: -7px;
+    position: absolute;
+  }
 }
+
 .jsoneditor-text-errors {
   tr {
     &.jump-to-line {
diff --git a/test/test_schema.html b/test/test_schema.html
index babd22b..77a668f 100644
--- a/test/test_schema.html
+++ b/test/test_schema.html
@@ -15,12 +15,19 @@
       padding-left: 40px;
     }
 
+    html, body {
+      width: 100%;
+      padding: 0;
+      box-sizing: border-box;
+    }
+
     code {
       background-color: #f5f5f5;
     }
 
     #jsoneditor {
-      width: 600px;
+      max-width: 600px;
+      width: 90%;
       height: 500px;
     }
   </style>