This points to the datalist element which contains the allowed values for that field.
该属性指向datalist元素，该元素包含该字段支持的值。
When you focus on the field, you get to see the possible values (in this case, several URLs) from the datalist, similar to Ajax style auto-suggest fields that are popular.
当您聚焦该字段时，您将看到来自datalist的可能值(本例中是几个URL)。
When you focus on the field, you get to see the possible values (in this case, several URLs) from the datalist, similar to Ajax style auto-suggest fields that are popular.
当您聚焦该字段时，您将看到来自datalist的可能值(本例中是几个URL)。
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