content: import time
  from dash import Dash, dcc, html
  
  
  def test_upca001_upload_children_gallery(dash_dcc):
      app = Dash(__name__)
      app.layout = html.Div(
          [
              html.Div(id="waitfor"),
              html.Label("Empty"),
              dcc.Upload(),
              html.Label("Button"),
              dcc.Upload(html.Button("Upload File")),
              html.Label("Text"),
              dcc.Upload("Upload File"),
              html.Label("Link"),
              dcc.Upload(html.A("Upload File")),
              html.Label("Style"),
              dcc.Upload(
                  ["Drag and Drop or ", html.A("Select a File")],
                  style={
                      "width": "100%",
                      "height": "60px",
                      "lineHeight": "60px",
                      "borderWidth": "1px",
                      "borderStyle": "dashed",
                      "borderRadius": "5px",
                      "textAlign": "center",
                  },
              ),
              dcc.Upload(
                  "upload",
                  disabled=True,
                  className_disabled="upload-disabled",
                  id="upload",
              ),
              dcc.Upload("upload", disabled=True, id="upload-no-className"),
          ]
      )
      dash_dcc.start_server(app)
      time.sleep(0.5)
      dash_dcc.percy_snapshot("upca001 children gallery")
  
      first_child = dash_dcc.find_element("#upload").find_element_by_css_selector(
          ":first-child"
      )
      # Check that there is no default style since className is specified
      style = first_child.get_attribute("style")
      assert "opacity: 0.5" not in style
  
      first_child = dash_dcc.find_element(
          "#upload-no-className"
      ).find_element_by_css_selector(":first-child")
  
      # Check that there is default style since no className is specified
      style = first_child.get_attribute("style")
      assert "opacity: 0.5" in style
  
      assert dash_dcc.get_logs() == []
  