Fixed accessibility issues

.gitignore

@@ -7,4 +7,5 @@ app/app.css
 
 # folders
 bower_components
-node_modules
+node_modules
+.idea

dist/md-data-table.css

@@ -2,12 +2,10 @@ md-backdrop.md-edit-dialog-backdrop {
   z-index: 80;
 }
 md-edit-dialog {
-  display: -webkit-flex;
   display: -ms-flexbox;
   display: flex;
-  -webkit-flex-direction: column;
-      -ms-flex-direction: column;
-          flex-direction: column;
+  -ms-flex-direction: column;
+      flex-direction: column;
   position: fixed;
   z-index: 81;
   background-color: #f9f9f9;
@@ -50,57 +48,47 @@ md-edit-dialog > .md-actions .md-button + .md-button {
   margin-left: 8px;
 }
 .md-table-pagination {
-  display: -webkit-flex;
   display: -ms-flexbox;
   display: flex;
-  -webkit-align-items: center;
-      -ms-flex-align: center;
-          align-items: center;
-  -webkit-justify-content: flex-end;
-      -ms-flex-pack: end;
-          justify-content: flex-end;
-  -webkit-flex-wrap: wrap-reverse;
-      -ms-flex-wrap: wrap-reverse;
-          flex-wrap: wrap-reverse;
+  -ms-flex-align: center;
+      align-items: center;
+  -ms-flex-pack: end;
+      justify-content: flex-end;
+  -ms-flex-wrap: wrap-reverse;
+      flex-wrap: wrap-reverse;
   box-sizing: border-box;
   padding: 0 24px;
   font-size: 12px;
   color: rgba(0, 0, 0, 0.54);
   border-top: 1px rgba(0, 0, 0, 0.12) solid;
 }
 .md-table-pagination md-select {
-  -webkit-justify-content: flex-end;
-      -ms-flex-pack: end;
-          justify-content: flex-end;
+  -ms-flex-pack: end;
+      justify-content: flex-end;
   min-width: 64px;
 }
 .md-table-pagination md-select:not([disabled]):focus .md-select-value {
   color: rgba(0, 0, 0, 0.54);
 }
 .md-table-pagination md-select .md-select-value {
-  -webkit-flex: 0 0 auto;
-      -ms-flex: 0 0 auto;
-          flex: 0 0 auto;
+  -ms-flex: 0 0 auto;
+      flex: 0 0 auto;
 }
 .md-table-pagination md-select .md-select-value span.md-select-icon {
-  -webkit-justify-content: center;
-      -ms-flex-pack: center;
-          justify-content: center;
+  -ms-flex-pack: center;
+      justify-content: center;
   text-align: center;
   margin-right: -6px !important;
 }
 .md-table-pagination md-select .md-select-value span.md-select-icon:after {
   top: initial;
-  -webkit-transform: scaleY(0.5) scaleX(1);
-          transform: scaleY(0.5) scaleX(1);
+  transform: scaleY(0.5) scaleX(1);
 }
 .md-table-pagination > * {
-  display: -webkit-flex;
   display: -ms-flexbox;
   display: flex;
-  -webkit-align-items: center;
-      -ms-flex-align: center;
-          align-items: center;
+  -ms-flex-align: center;
+      align-items: center;
   height: 56px;
 }
 .md-table-pagination > .buttons:not(:first-child),
@@ -128,22 +116,18 @@ md-select.md-table-select > .md-select-value {
 md-select.md-table-select > .md-select-value > span {
   display: block;
   height: auto;
-  -webkit-transform: none !important;
-          transform: none !important;
+  transform: none !important;
 }
 md-select.md-table-select > .md-select-value > span > .md-text {
   display: inherit;
   height: inherit;
-  -webkit-transform: inherit;
-          transform: inherit;
+  transform: inherit;
 }
 md-select.md-table-select > .md-select-value > span.md-select-icon {
-  display: -webkit-flex;
   display: -ms-flexbox;
   display: flex;
-  -webkit-align-items: center;
-      -ms-flex-align: center;
-          align-items: center;
+  -ms-flex-align: center;
+      align-items: center;
   height: 24px;
   margin: 0;
 }
@@ -271,16 +255,13 @@ table.md-table th.md-column md-icon {
 table.md-table th.md-column md-icon.md-sort-icon {
   color: rgba(0, 0, 0, 0.26);
   opacity: 0;
-  transition: -webkit-transform 0.25s, opacity 0.25s;
   transition: transform 0.25s, opacity 0.25s;
 }
 table.md-table th.md-column md-icon.md-sort-icon.md-asc {
-  -webkit-transform: rotate(0deg);
-          transform: rotate(0deg);
+  transform: rotate(0deg);
 }
 table.md-table th.md-column md-icon.md-sort-icon.md-desc {
-  -webkit-transform: rotate(180deg);
-          transform: rotate(180deg);
+  transform: rotate(180deg);
 }
 table.md-table th.md-column md-icon:not(:first-child) {
   margin-left: 8px;
@@ -362,33 +343,32 @@ table.md-table th.md-column md-checkbox {
   margin: 0;
   width: 20px;
 }
+table.md-table th .hidden-title {
+  display: none;
+}
 table.md-table td.md-cell {
   color: rgba(0, 0, 0, 0.87);
   font-size: 13px;
   border-top: 1px rgba(0, 0, 0, 0.12) solid;
 }
 table.md-table td.md-cell.md-numeric md-select {
-  -webkit-justify-content: flex-end;
-      -ms-flex-pack: end;
-          justify-content: flex-end;
+  -ms-flex-pack: end;
+      justify-content: flex-end;
 }
 table.md-table td.md-cell.md-numeric md-select .md-select-value {
-  -webkit-flex: 0 0 auto;
-      -ms-flex: 0 0 auto;
-          flex: 0 0 auto;
+  -ms-flex: 0 0 auto;
+      flex: 0 0 auto;
 }
 table.md-table td.md-cell.md-placeholder {
   color: rgba(0, 0, 0, 0.26);
 }
 table.md-table td.md-cell md-select > .md-select-value > span.md-select-icon {
-  -webkit-justify-content: flex-end;
-      -ms-flex-pack: end;
-          justify-content: flex-end;
+  -ms-flex-pack: end;
+      justify-content: flex-end;
   color: rgba(0, 0, 0, 0.54);
   width: 18px;
   text-align: right;
 }
 table.md-table td.md-cell md-select > .md-select-value > span.md-select-icon:after {
-  -webkit-transform: scaleY(0.4) scaleX(0.8);
-          transform: scaleY(0.4) scaleX(0.8);
+  transform: scaleY(0.4) scaleX(0.8);
 }