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body{
    text-size-adjust: none;
    -webkit-text-size-adjust: none;
    -moz-text-size-adjust: none;
    -ms-text-size-adjust: none;
}

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.noselect {
  -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Chrome/Safari/Opera */
     -khtml-user-select: none; /* Konqueror */
       -moz-user-select: none; /* Firefox */
        -ms-user-select: none; /* Internet Explorer/Edge */
            user-select: none; /* Non-prefixed version, currently
                                  not supported by any browser */
}

BumbuKhan

git rm --cached <file> - Delete file from git and stop tracking. This command also deletes <file> in remote repository
git rm -r --cached <folder> - The same thing but works recursively.
git update-index --assume-unchanged <file> - Use this command to prevent git from detecting changes in <file>

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composer global require fxp/composer-asset-plugin --no-plugins

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composer update new/package

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Do 
$model->save();

before
$model->file->saveAs()

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If any javaScript conflict occurs while using Yii2 ActiveForm widget use this config

ActiveForm::begin([
  'enableClientScript' => false
])

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@mixin border-radius-partial($radius, $part:null) {
  @if ($part) {
    -webkit-border-#{$part}-radius: $radius;
    -moz-border-#{$part}-radius: $radius;
    -ms-border-#{$part}-radius: $radius;
    border-#{$part}-radius: $radius;
  }
  @else {
    -webkit-border-radius: $radius;
    -moz-border-radius: $radius;

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.clearfix::before, .clearfix::after {
    content: "";
    display: table;
}

.clearfix::after {
    clear: both;
}

.clearfix {

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// in controller
Yii::$app->view->params['message_to_layout'] = 'This message will be shown in layout';

// in layout (and in any view!)
<?=$this->params['message_to_layout']?>