网页设计中html5的video 标签如何写才能使得视频文件填满整个div？
推荐回答（3个）
想要video能自动填充慢父div的大小，只要给video标签加上style="width= 100%; height=100%; object-fit: fill"即可。
object-fit语法
object-fit属性的语法非常的简单：
object-fit:fill | contain | cover | none | scale-down
object-fit取值说明
object-fit主要适合于替换元素，比如：
fill:此值为boject-fit的默认值，替换内容的大小被设置为填充元素的内容框，也就是说，元素的内容扩大到完全填充容器的外形尺寸，即使这打破其内在的宽高比。
contain：替换元素内容大小保持长宽比例填充元素内容容器，其具体对象大小被解析为一个包含元素的宽度和高度。也就是说，如果你在替换元素上设置一个明确的高度和宽度，此值将导致内容大小，完全在固定的比例显示，但仍在元素尺寸内显示。
cover：替换元素内容大小保持长宽比例填充元素内容容器，其具体对象大小被解析为覆盖整个元素的宽度和高度。也就是说，替换元素内容大小保持长宽比，但改变宽度和高度，以便完全覆盖内容元素。
none：替换元素内容不调整大小以适应内部元素的容器，内容完全忽略设置在元素上的任何高度和权重，并且仍在元素尺寸内显示。
scale-down：当内容大小设置了non或contain，将导致具体对象变得更小。
设置video标签的宽和高，为父级div的宽高，不要使用controls属性！
父集div使用relative定位，padding属性填充空间
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