文件输入“值”属性未通过html验证

Question

I have done some looking around for a solution of this problem, but I seem to be at a dead end. Some articles say, that the value attribute for a file input field has to be omitted, where as other articles state the exact opposite. I am using https://validator.w3.org/nu/ to check my HTML for errors, and this is the last remaining one.

The website is build on top of the Yii2 framework, using Kartik`s file upload widget with the following code:

echo FileInput::widget([
    'model' => $model,
    'attribute' => 'file',
    'options' => ['multiple' => false],
    'pluginOptions' => [
         'allowedFileExtensions'=>['doc', 'docx', 'jpg', 'png', 'pdf'],
         'showUpload' => false,
         'browseLabel' => '',
         'removeLabel' => '',
         'mainClass' => 'input-group-lg'
        ]
]);

The error I get when I try to validate my HTML code is the following: Attribute value not allowed on element input at this point., since apparently the widget puts a default value="" attribute in the file input field.

I would greatly appreciate any suggestions on how to solve this issue!

Thank you in advance!