# without `<table>`
str = '<tr class="text-gray-500"><td>some content</td></tr>'
Nokogiri::HTML5.fragment(str)

=> #(DocumentFragment:0x269f8 { name = "#document-fragment", children = [ #(Text "some content")] })

# with `<table>`
str = '<table><tr class="text-gray-500"><td>some content</td></tr></table>'
Nokogiri::HTML4.fragment(str)

=> 
#(DocumentFragment:0x26fb0 {
  name = "#document-fragment",
  children = [
    #(Element:0x27028 {
      name = "table",
      children = [
        #(Element:0x270a0 {
          name = "tbody",
          children = [ #(Element:0x27118 { name = "tr", attribute_nodes = [ #(Attr:0x27190 { name = "class", value = "text-gray-500" })], children = [ #(Element:0x27268 { name = "td", children = [ #(Text "some content")] })] })]
          })]
      })]
  })