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  4. HTML attribute: min

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min attribute defines the minimum value that is acceptable and valid for the input containing the attribute. If the value of the element is less than this, the element fails constraint validation . This value must be less than or equal to the value of the max attribute. If a value is specified for min that isn't a valid number, the input has no minimum value.

Valid for the numeric input types, including the date , month , week , time , datetime-local , number and range types, and the <meter> element, the min attribute is a number that specifies the most negative value a form control to be considered valid.

句法

Syntax for min values by input type
Input type 范例 范例
date yyyy-mm-dd <input type="date" min="2019-12-25" step="1">
month yyyy-mm <input type="month" min="2019-12" step="12">
week yyyy-W## <input type="week" min="2019-W23" step="">
time hh:mm <input type="time" min="09:00" step="900">
datetime-local yyyy-mm-ddThh:mm <input type="datetime-local" min="2019-12-25T19:30">
number <number> <input type="number" min="0" step="5" max="100">
range <number> <input type="range" min="60" step="5" max="100">

注意： When the data entered by the user doesn't adhere to the min value set, the value is considered invalid in contraint validation and will match the :invalid pseudoclass

见 Client-side validation and rangeUnderflow 了解更多信息。

对于 <meter> element, the min attribute defines the lower numeric bound of the measured range. This must be less than the minimum value ( max attribute), if specified. In both cases, if omitted, the value defaults to 1.

Syntax for min values for other elements
Input type 句法 范例
<meter> <number> <meter id="fuel" min="0" max="100" low="33" high="66" optimum="80" value="40"> at 40/100</meter>

Impact on step

值 min and step define what are valid values, even if the step attribute is not included, as step 默认为 0 .

We add a big red border around invalid inputs: 

input:invalid {
  border: solid red 3px;
}

Then define an input with a minimum value of 7.2, omitting the step attribute, wherein it defaults to 1. 

<input id="myNumber" name="myNumber" type="number" min="7.2" value="8">

因为 step defaults to 1, valid values include 7.2 , 8.2 , 9.2 , and so on. The value 8 is not valid. As we included an invalid value, supporting browsers will show the value as invalid.

If not explicitly included, step defaults to 1 for 编号 and range , and 1 unit type (second, week, month, day) for the date/time input types.

可访问性关注

Provide instructions to help users understand how to complete the form and use individual form controls. Indicate any required and optional input, data formats, and other relevant information. When using the min attribute, ensure this minimum requirement is understood by the user. Providing instructions within the <label> may be sufficient. If providing instructions outside of labels, which allows more flexible positioning and design, consider using aria-labelledby or aria-describedby .

规范

规范 状态 注释
HTML 实时标准
The definition of 'min attribute' in that specification. 		实时标准
HTML5
The definition of 'min attribute' in that specification. 		推荐

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

No compatibility data found. Please contribute data for "html.elements.attributes.min" (depth: 1) to the MDN 兼容性数据存储库 .

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