diff --git a/edit/edit.css b/edit/edit.css
index e9167b2e..6e8c1dca 100644
--- a/edit/edit.css
+++ b/edit/edit.css
@@ -195,6 +195,8 @@ input:invalid {
   border-bottom: 1px dotted transparent;
   margin-top: .1em;
   margin-bottom: .1em;
+  margin-left: -13px;
+  padding-left: 13px; /* clicking directly on details-marker doesn't set pref so we cover it with h2 */
 }
 
 #header summary:hover h2 {
@@ -272,7 +274,7 @@ input:invalid {
   border-top: 2px solid hsl(0, 0%, 80%);
 }
 .section-editor:not(.section-editor-ready) .section {
-  visibility: hidden;
+  opacity: 0 !important;
 }
 .section-editor:not(.section-editor-ready) .CodeMirror {
   height: 0;
@@ -654,21 +656,48 @@ body:not(.find-open) [data-match-highlight-count="1"] .CodeMirror-selection-high
 
 /************ lint ************/
 #lint {
+  overflow: hidden;
+  margin: .5rem -1rem 0;
+  min-height: 30px;
+  padding: 0;
+  box-sizing: border-box;
+  display: flex;
+  flex-grow: 1;
+  position: relative;
+}
+#lint > summary {
+  position: relative;
+  margin-left: 0;
+  padding-left: 4px;
+}
+#lint[open]:not(.hidden-unless-compact) {
+  min-height: 130px;
+}
+#lint summary h2 {
+  margin-left: -16px;
+}
+#lint > .lint-scroll-container {
+  margin: 42px 1rem 0;
+  position: absolute;
+  top: 0;
+  bottom: 0;
+  left: 0;
+  right: 0;
   overflow-y: auto;
   overflow-x: hidden;
-  }
-#lint > summary {
-  /* workaround for overflow:auto to show the toggle triangle */
-  position: absolute;
-}
-#lint > div {
-  margin-top: 2.75rem;
 }
 #lint table {
   font-size: 100%;
   border-spacing: 0;
   margin-bottom: 1rem;
   line-height: 1.0;
+  width: 100%;
+}
+#lint tr td:last-child {
+  width: 100%;
+}
+#lint td[role="line"] {
+  padding-left: 0.25rem;
 }
 #lint table:last-child {
   margin-bottom: 0;
@@ -679,6 +708,7 @@ body:not(.find-open) [data-match-highlight-count="1"] .CodeMirror-selection-high
 #lint caption {
   text-align: left;
   font-weight: bold;
+  padding-bottom: 6px;
 }
 #lint tbody {
   font-size: 85%;
@@ -759,13 +789,13 @@ html:not(.usercss) .usercss-only,
   display: none !important; /* hide during page init */
 }
 
-#lint {
-  padding: 1rem 0 0;
-  box-sizing: border-box;
+body:not(.compact-layout) .hidden-unless-compact,
+body.linter-disabled .hidden-unless-compact {
+  display: none !important;
 }
 
 #options:not([open]) + #lint {
-  padding-top: 0;
+  margin-top: 0;
 }
 
 #options-wrapper .options-column:nth-child(2) {
@@ -846,6 +876,21 @@ html:not(.usercss) .usercss-only,
     border-bottom: 1px dashed #AAA;
     padding: 0;
   }
+  .fixed-header {
+    padding-top: 40px;
+  }
+  .fixed-header #header {
+    min-height: 40px;
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    padding: 8px 0 0;
+    background-color: #fff;
+  }
+  .fixed-header #header > *:not(#lint) {
+    display: none !important;
+  }
   #actions {
     display: flex;
     flex-wrap: wrap;
@@ -898,17 +943,10 @@ html:not(.usercss) .usercss-only,
   #options:not([open]) + #lint:not([open]) {
     margin-top: 0;
   }
-  #lint {
-    overflow: initial;
-  }
   #lint summary {
     position: static;
     margin-bottom:  0;
   }
-  #lint tbody {
-    display: flex;
-    flex-direction: column;
-  }
   #options summary {
     margin-left: 0;
     padding-left: 4px;
@@ -927,25 +965,17 @@ html:not(.usercss) .usercss-only,
     position: relative;
     top: 0.2rem;
   }
-  #lint > div {
-    margin-top: 0;
-    overflow: hidden;
+  #lint > .lint-scroll-container {
+    margin: 32px 1rem 0;
+    bottom: 6px;
   }
   #lint {
-    padding: 0 1rem .5rem;
+    padding: 0;
+    margin: 1rem 0 0;
   }
   #lint > summary {
     margin-top: 0;
   }
-  #lint caption {
-    text-indent: 4px;
-  }
-  #lint table {
-    width: 100%;
-  }
-  #lint td[role="message"] {
-    max-width: none;
-  }
   #lint:not([open]) + #footer {
     margin: .25em 0 -1em .25em;
   }
diff --git a/edit/edit.js b/edit/edit.js
index 78b6e78c..c44a8c59 100644
--- a/edit/edit.js
+++ b/edit/edit.js
@@ -172,8 +172,8 @@ preinit();
         $('#preview-label').classList.toggle('hidden', !style.id);
 
         $('#beautify').onclick = () => beautify(editor.getEditors());
-        $('#lint').addEventListener('scroll', hideLintHeaderOnScroll, {passive: true});
-        window.addEventListener('resize', () => debounce(rememberWindowSize, 100));
+        window.addEventListener('resize', () => { debounce(rememberWindowSize, 100); detectLayout(); });
+        detectLayout();
         editor = (usercss ? createSourceEditor : createSectionsEditor)({
           style,
           onTitleChanged: updateTitle
@@ -476,15 +476,6 @@ function showCodeMirrorPopup(title, html, options) {
   return popup;
 }
 
-function hideLintHeaderOnScroll() {
-  // workaround part2 for the <details> not showing its toggle icon: hide <summary> on scroll
-  const newOpacity = this.scrollTop === 0 ? '' : '0';
-  const style = this.firstElementChild.style;
-  if (style.opacity !== newOpacity) {
-    style.opacity = newOpacity;
-  }
-}
-
 function rememberWindowSize() {
   if (
     document.visibilityState === 'visible' &&
@@ -500,6 +491,63 @@ function rememberWindowSize() {
   }
 }
 
+prefs.subscribe(['editor.linter'], (key, value) => {
+  if(value === '') {
+    document.body.classList.add('linter-disabled');
+  } else {
+    document.body.classList.remove('linter-disabled');
+  }
+});
+
+function fixedHeader() {
+  const scrollPoint = $('#header').clientHeight - 40;
+  const linterEnabled = prefs.get('editor.linter') !== '';
+  if (window.scrollY >= scrollPoint && !document.body.classList.contains('fixed-header') && linterEnabled) {
+    document.body.classList.add('fixed-header');
+  } else if (window.scrollY < 40 && linterEnabled) {
+    document.body.classList.remove('fixed-header');
+  }
+}
+
+function detectLayout() {
+  const compact = window.innerWidth <= 850;
+  const shortViewportLinter = window.innerHeight < 692;
+  const shortViewportNoLinter = window.innerHeight < 554;
+  const linterEnabled = prefs.get('editor.linter') !== '';
+  if (compact) {
+    const scrollPoint = $('#header').clientHeight - 40;
+    if (window.scrollY >= scrollPoint && !document.body.classList.contains('fixed-header') && linterEnabled) {
+      document.body.classList.add('fixed-header');
+    }
+    document.body.classList.add('compact-layout');
+    $('#options').removeAttribute('open');
+    $('#options').classList.add('ignore-pref');
+    $('#lint').removeAttribute('open');
+    $('#lint').classList.add('ignore-pref');
+    window.addEventListener('scroll', fixedHeader);
+  } else {
+    document.body.classList.remove('compact-layout');
+    document.body.classList.remove('fixed-header');
+    window.removeEventListener('scroll', fixedHeader);
+    if (shortViewportLinter && linterEnabled || shortViewportNoLinter && !linterEnabled) {
+      $('#options').removeAttribute('open');
+      $('#options').classList.add('ignore-pref');
+      if (prefs.get('editor.lint.expanded')) {
+        $('#lint').setAttribute('open', '');
+      }
+    } else {
+      $('#options').classList.remove('ignore-pref');
+      $('#lint').classList.remove('ignore-pref');
+      if (prefs.get('editor.options.expanded')) {
+        $('#options').setAttribute('open', '');
+      }
+      if (prefs.get('editor.lint.expanded')) {
+        $('#lint').setAttribute('open', '');
+      }
+    }
+  }
+}
+
 function isWindowMaximized() {
   return (
     window.screenX <= 0 &&
diff --git a/edit/linter-report.js b/edit/linter-report.js
index bc38db11..35029524 100644
--- a/edit/linter-report.js
+++ b/edit/linter-report.js
@@ -37,7 +37,7 @@ Object.assign(linter, (() => {
   function updateCount() {
     const issueCount = Array.from(tables.values())
       .reduce((sum, table) => sum + table.trs.length, 0);
-    $('#lint').classList.toggle('hidden', issueCount === 0);
+    $('#lint').classList.toggle('hidden-unless-compact', issueCount === 0);
     $('#issue-count').textContent = issueCount;
   }
 
@@ -148,7 +148,7 @@ Object.assign(linter, (() => {
         col.textContent = anno.from.ch + 1;
         message.title = clipString(anno.message, 1000) +
           (anno.rule ? `\n(${anno.rule})` : '');
-        message.textContent = clipString(anno.message, 100);
+        message.textContent = clipString(anno.message, 100).replace(/ at line.*/, '');
       }
     }
   }