Common knowledge points of HTML and CSS

Tel ruishao 2020-11-09 22:18:11
common knowledge points html css

###### 1.  Hide progress bar
>  1. Foxes hide scrollbars  
        scrollbar-width: none;  


> 2.  Google hides scrollbars , It's better to write it here ul Below the pattern , I tried to write it on it and it didn't work  
    ul::-webkit-scrollbar {
        width: 0;
        ``<!-- display:none; -->``


###### 2. Hidden elements
> 1. opacity: Set the transparency of an element
    .hide {opacity: 0;}


> 2. visibility: Set an element to be visible / invisible
    .hide {visibility: hidden;}


> 3. display: Set show and hide ( Hidden elements don't take place )
    .hide {display: none;}


> 4. position: Set element position
    .hide {
     position: absolute;
     top: -9999px;
     left: -9999px;


> 5. clip-path:
    .hide {
     clip-path: polygon(0px 0px, 0px 0px, 0px 0px, 0px 0px);


###### 3.  The background fills the screen   background-size
> 1. background-size:100% 100%; --- Fill up in proportion to the container , Image distortion ;


> 2. background-size:cover; --- Enlarge the background image to fit the element container , The scale of the picture is the same , But be careful , The part beyond the container may be cut off .


>  Be careful : background-size: This property has two values , The first value is x In the direction of the axis
     Scaling or px, The second value is y Scaling in the axis direction or px, If you write only one value , The second value defaults to auto( According to the original scale of the picture , And the existing width , To determine the height )


###### 4.  The background is transparent


> 1. opacity: x; x The values for 0 To 1, Such as opacity: 0.5 It means that the opacity is 50%.
  opacity Compatibility :IE6、7、8 Don't support ,IE9 And above and other standard browsers support . But use opacity Setting the opacity of an element causes all its descendants to have transparency along with it , Generally used to adjust the overall opacity of pictures or modules .


> 2. rgba(red,green,blue,alpha); alpha The values for 0 To 1.
    rgba Set the opacity of the color , It's usually used to adjust background-color、color、box-shadow And so on .


> 3. IE Exclusive filter filter:Alpha(opacity=x),x The values for 0 To 100, Such as filter:Alpha(opacity=50) It means that the opacity is 50%.

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