select-required-attribute.tentative.html

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This WPT test may be referenced by the following Test IDs:
- /html/semantics/forms/the-select-element/select-required-attribute.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html lang="en">

<title>HTMLselectElement Test: required attribute</title>

<link rel="author" title="Ionel Popescu" href="mailto:iopopesc@microsoft.com">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<style>

  select:required {

    border: 3px dashed rgb(255, 0, 0);

  select:optional {

    border: 1px solid rgb(128, 128, 128);

  select, ::picker(select) {

    appearance: base-select;

</style>

<select id="select0" required>

  <option>one</option>

  <option>two</option>

  <option>three</option>

</select>

<select id="select1">

  <option>one</option>

  <option>two</option>

  <option>three</option>

</select>

<select id="select2">

  <option>one</option>

  <option>two</option>

  <option>three</option>

</select>

<script>

function checkRequired(style) {

  assert_equals(style.borderWidth, '3px');

  assert_equals(style.borderStyle, 'dashed');

  assert_equals(style.borderColor, 'rgb(255, 0, 0)');

function checkOptional(style) {

  assert_equals(style.borderWidth, '1px');

  assert_equals(style.borderStyle, 'solid');

  assert_equals(style.borderColor, 'rgb(128, 128, 128)');

test(() => {

  const select0 = document.getElementById("select0");

  const select1 = document.getElementById("select1");

  const select2 = document.getElementById("select2");

  checkRequired(window.getComputedStyle(select0));

  checkOptional(window.getComputedStyle(select1));

  checkOptional(window.getComputedStyle(select2));

  select2.required = true;

  checkRequired(window.getComputedStyle(select2));

}, "Test required attribute");

</script>