public SafeHtmlBuilder setFormmethod(String value) {
    """
	Sets the {@code formmethod} attribute for this element.
	
	<p>The attribute {@code formmethod} with a {@code String} value is allowed on these elements:
	
	<ul>
	<li>{@code button}
	<li>{@code input}
	</ul>
	
	@throws IllegalArgumentException if the {@code formmethod} attribute with a {@code String}
	value is not allowed on this element
    """
    if (!FORMMETHOD_STRING_ELEMENT_WHITELIST.contains(elementName)) {
      throw new IllegalArgumentException(
          "Attribute \"formmethod\" with a String value can only be used "
              + "by one of the following elements: "
              + FORMMETHOD_STRING_ELEMENT_WHITELIST);
    }
    return setAttribute("formmethod", value);
  }
public SafeHtmlBuilder setFormmethod(String value) {
    if (!FORMMETHOD_STRING_ELEMENT_WHITELIST.contains(elementName)) {
      throw new IllegalArgumentException(
          "Attribute \"formmethod\" with a String value can only be used "
              + "by one of the following elements: "
              + FORMMETHOD_STRING_ELEMENT_WHITELIST);
    }
    return setAttribute("formmethod", value);
  }
public SafeHtmlBuilder setFormmethod ( String value ) { if ( ! FORMMETHOD_STRING_ELEMENT_WHITELIST . contains ( elementName ) ) { throw new IllegalArgumentException ( "Attribute \"formmethod\" with a String value can only be used " + "by one of the following elements: " + FORMMETHOD_STRING_ELEMENT_WHITELIST ) ; } return setAttribute ( "formmethod" , value ) ; }
Sets the {@code formmethod} attribute for this element.

<p>The attribute {@code formmethod} with a {@code String} value is allowed on these elements:

<ul>
<li>{@code button}
<li>{@code input}
</ul>

@throws IllegalArgumentException if the {@code formmethod} attribute with a {@code String}
value is not allowed on this element
Sets the { @code formmethod } attribute for this element .