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Test Info:

// Keep this mostly synchronized with
// html/semantics/forms/attributes-common-to-form-controls/dirname-only-if-applies.html
// except that won't have "reset" and "button" as those don't submit their value
[
"hidden",
"text",
"search",
"tel",
"url",
"email",
"password",
"submit",
"reset",
"button"
].forEach(type => {
test(t => {
const input = document.createElement("input");
t.add_cleanup(() => input.remove());
input.type = type;
assert_equals(input.type, type);
document.body.append(input);
input.setAttribute("value", "\u05D0"); // The Hebrew letter Alef (strongly RTL)
assert_true(input.matches(":dir(ltr)"));
input.removeAttribute("value");
input.dir = "auto";
input.setAttribute("value", "\u05D0");
assert_true(input.matches(":dir(rtl)"));
input.removeAttribute("value");
assert_true(input.matches(":dir(ltr)"));
input.value = "\u05D0";
assert_true(input.matches(":dir(rtl)"));
}, `<input dir=auto type=${type}> directionality`);
});
[
"date",
"month",
"week",
"time",
"datetime-local",
"number",
"range",
"color",
"checkbox",
"radio",
// "file" // value setter throws
"image"
].forEach(type => {
test(t => {
const input = document.createElement("input");
t.add_cleanup(() => input.remove());
input.type = type;
assert_equals(input.type, type);
input.dir = "auto";
input.value = "\u05D0"; // The Hebrew letter Alef (strongly RTL)
document.body.append(input);
assert_true(input.matches(":dir(ltr)"));
}, `<input dir=auto type=${type}> directionality`);
});
test(t => {
const input = document.createElement("textarea");
t.add_cleanup(() => input.remove());
input.dir = "auto";
input.value = "\u05D0"; // The Hebrew letter Alef (strongly RTL)
document.body.append(input);
assert_true(input.matches(":dir(rtl)"));
}, `<textarea dir=auto> directionality`);