2 files changed, 12 insertions, 17 deletions
diff --git a/node_modules/autoprefixer/lib/hacks/user-select.js b/node_modules/autoprefixer/lib/hacks/user-select.js
index 850f9816..f73831d2 100644
--- a/node_modules/autoprefixer/lib/hacks/user-select.js
+++ b/node_modules/autoprefixer/lib/hacks/user-select.js
@@ -7,6 +7,11 @@ class UserSelect extends Declaration {
   insert(decl, prefix, prefixes) {
     if (decl.value === 'all' && prefix === '-ms-') {
       return undefined
+    } else if (
+      decl.value === 'contain' &&
+      (prefix === '-moz-' || prefix === '-webkit-')
+    ) {
+      return undefined
     } else {
       return super.insert(decl, prefix, prefixes)
     }
diff --git a/node_modules/autoprefixer/lib/processor.js b/node_modules/autoprefixer/lib/processor.js
index 1fc531f4..8a463c7f 100644
--- a/node_modules/autoprefixer/lib/processor.js
+++ b/node_modules/autoprefixer/lib/processor.js
@@ -94,11 +94,6 @@ class Processor {
         return displayGrid || gridTemplate || gridGap
       })
     }
-    function insideFlex(decl) {
-      return decl.parent.some(node => {
-        return node.prop === 'display' && /(inline-)?flex/.test(node.value)
-      })
-    }
 
     let gridPrefixes =
       this.gridStatus(css, result) &&
@@ -147,17 +142,6 @@ class Processor {
             { node: decl }
           )
         }
-      } else if (
-        /^(align|justify|place)-(items|content)$/.test(prop) &&
-        insideFlex(decl)
-      ) {
-        if (value === 'start' || value === 'end') {
-          result.warn(
-            `${value} value has mixed support, consider using ` +
-              `flex-${value} instead`,
-            { node: decl }
-          )
-        }
       } else if (prop === 'text-decoration-skip' && value === 'ink') {
         result.warn(
           'Replace text-decoration-skip: ink to ' +
@@ -712,7 +696,13 @@ class Processor {
    * Some rare old values, which is not in standard
    */
   withHackValue(decl) {
-    return decl.prop === '-webkit-background-clip' && decl.value === 'text'
+    return (
+      (decl.prop === '-webkit-background-clip' && decl.value === 'text') ||
+      // Do not remove -webkit-box-orient when -webkit-line-clamp is present.
+      // https://github.com/postcss/autoprefixer/issues/1510
+      (decl.prop === '-webkit-box-orient' &&
+        decl.parent.some(d => d.prop === '-webkit-line-clamp'))
+    )
   }
 }