H5 image mask
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(1) Knowledge preparation
a.transform-origin
transform-origin: x-axis y-axis z-axis;
x-axis values are for example left, center, right, length, %, default center is 50%, which refers to the position of the origin of the x-axis coordinate relative to the width of the element. For example, the y-axis values are top, center, bottom, and length. %. The default center is 50%, which refers to the origin of the y-axis coordinate relative to the width of the element. At the high position of the element
I personally feel that it would be better to swap the values of x-axis and y-axis. You can have this understanding: draw the y-axis on the left and draw the x-axis on the center. Then the two The intersection of the axes is the origin of the coordinate axis
b. The combination of transition and transformation
transition-duration:500ms;
transform:rotate(0deg)
It takes 500ms to rotate the element to 0 degrees
c. #lol: hover p:nth-child(2)
When the mouse is placed on the element A with the id of lol, if the second one of all the child elements of A is a p element, the match is successful.
d.Key code
#lol:hover p:nth-child(2)/*鼠标放在p元素上时触发*/
{
transform:rotate(0deg)
/*等价于transform:translate(0px,0px) rotate(0deg) 不要忘记默认属性*/
/* transition-duration:500ms;transform-origin:right bottom;不写也是一样的，因为#lol p:nth-child(2)设置了*/
}
#lol p:nth-child(2)/*浏览器显示p元素时执行*/
{
transition-duration:500ms;
transform-origin:right bottom;
transform:rotate(90deg);
…
}(2) All codes
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
<title>为了生活</title>
<style type="text/css">
*
{
margin:0px;
padding:0;
}
#lol
{
width:222px;
height:221px;
position:relative;
overflow:hidden;
cursor:pointer;
margin:20px auto;
border:10px #333 solid;
}
#lol:hover p:nth-child(2)
{
transform:rotate(0deg)
}
#lol p:nth-child(2)
{
width:222px;
height:221px;
position:absolute;
transition-duration:500ms;
transform-origin:right bottom;
transform:rotate(90deg);
background:orange;
top:0px;
left:0px;
}
</style>
</head
<body>
<div id="lol">
<img src="images/H5 image mask" alt="H5 image mask" >
<p>Hello World</p>
</div>
</body>
</html>
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