diff --git a/src/ext/conf/ExtensionConf.js b/src/ext/conf/ExtensionConf.js
index 8d5f339..b7ae85d 100644
--- a/src/ext/conf/ExtensionConf.js
+++ b/src/ext/conf/ExtensionConf.js
@@ -818,7 +818,6 @@ var ExtensionConf = {
                        ExtensionMode.Disabled,     // if autoar is disabled, this setting is irrelevant
       stretch: Stretch.NoStretch,                  // Default stretch mode. 
       videoAlignment: VideoAlignment.Center,       // Video alignment
-
     },
     "www.youtube.com" : {
       mode: ExtensionMode.Enabled,
@@ -837,6 +836,19 @@ var ExtensionConf = {
       type: 'official',
       stretch: Stretch.Default,
       videoAlignment: VideoAlignment.Default,
+      autoarPreventConditions: {        // prevents autoar on following conditions
+        videoStyleString: {             // if video style string thing does anything of what follows
+          containsProperty: {           // if video style string has any of these properties (listed as keys)
+            'height': {                 // if 'height' property is present in style attribute, we prevent autoar from running
+              allowedValues: [          // unless attribute is equal to anything in here. Optional.
+                '100%'
+              ]
+            }
+            // 'width': true            // this would prevent aard from runing if <video> had a 'width' property in style, regardless of value
+                                        // could also be an empty object, in theory.
+          }
+        }
+      }
     },
   }
 }
diff --git a/src/ext/lib/Settings.js b/src/ext/lib/Settings.js
index 5d6ff40..f95a8fd 100644
--- a/src/ext/lib/Settings.js
+++ b/src/ext/lib/Settings.js
@@ -306,6 +306,7 @@ class Settings {
   }
 
   canStartAutoAr(site) {
+    // 'site' argument is only ever used when calling this function recursively for debugging
     if (!site) {
       site = window.location.host;
 
diff --git a/src/ext/lib/video-transform/Resizer.js b/src/ext/lib/video-transform/Resizer.js
index 2824f94..6445f52 100644
--- a/src/ext/lib/video-transform/Resizer.js
+++ b/src/ext/lib/video-transform/Resizer.js
@@ -142,6 +142,50 @@ class Resizer {
       return;
     }
 
+    if (ar.type === AspectRatio.Automatic || 
+        ar.type === AspectRatio.Reset && this.lastAr.type === AspectRatio.Initial) {
+      // some sites do things that interfere with our site (and aspect ratio setting in general)
+      // first, we check whether video contains anything we don't like
+
+      const siteSettings = this.settings.active.sites[window.location.host];
+      if (siteSettings && siteSettings.autoarPreventConditions) {
+        if (siteSettings.autoarPreventConditions.videoStyleString) {
+          const styleString = this.video.getAttribute('style').split(';');
+
+          if (siteSettings.autoarPreventConditions.videoStyleString.containsProperty) {
+            const bannedProperties = siteSettings.autoarPreventConditions.videoStyleString.containsProperty;
+            for (const prop in bannedProperties) {
+              for (const s of styleString) {
+                if (s.trim().startsWith(prop)) {
+
+                  // check if css property has a list of allowed values:
+                  if (bannedProperties[prop].allowedValues) {
+                    const styleValue = s.split(':')[1].trim();
+
+                    // check if property value is on the list of allowed values
+                    // if it's not, we aren't allowed to start aard
+                    if (bannedProperties[prop].allowedValues.indexOf(styleValue) === -1) {
+                      if (Debug.debug) {
+                        console.log("%c[Resizer::setAr] video style contains forbidden css property/value combo: ", "color: #900, background: #100", prop, " — we aren't allowed to start autoar.")
+                      }
+                      return;
+                    }
+                  } else {
+                    // no allowed values, no problem. We have forbidden property
+                    // and this means aard can't start.
+                    if (Debug.debug) {
+                      console.log("%c[Resizer::setAr] video style contains forbidden css property: ", "color: #900, background: #100", prop, " — we aren't allowed to start autoar.")
+                    }
+                    return;
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+
     if (lastAr) {
       this.lastAr = this.calculateRatioForLegacyOptions(lastAr);
       ar = this.calculateRatioForLegacyOptions(ar);
@@ -469,7 +513,14 @@ class Resizer {
     }
 
     if(Debug.debug) {
-      console.log("[Resizer::_res_computeOffsets] <rid:"+this.resizerId+"> calculated offsets:", translate);
+      console.log("[Resizer::_res_computeOffsets] <rid:"+this.resizerId+"> calculated offsets:\n\n",
+      '---- data in ----\n',
+      'player dimensions:', {w: this.conf.player.dimensions.width, h: this.conf.player.dimensions.height},
+      'video dimensions: ', {w: this.conf.video.offsetWidth, h: this.conf.video.offsetHeight},
+      'stretch factors:  ', stretchFactors,
+      'pan & zoom:       ', this.pan, this.zoom,
+      '\n\n---- data out ----\n',
+      'translate:', translate);
     }
 
     return translate;