html - Multiple nth-last-child does't work as expected. Why? -


i have following html:

<ul>     <li>1</li>     <li>2</li>     <li>3</li>     <li>4</li>     <li>5</li>     <li>6</li>     <li>7</li>     <li>8</li>     <li>9</li>     <li>10</li>     <li>11</li>     <li>12</li> </ul>

and following css applied it:

body {     padding: 0;     margin: 0;     display: flex;     align-items:center;     justify-content:center;     height: 100vh;     background: #eee; }  ul {     max-width: 400px;     min-width: 400px; }  ul > li {     overflow: hidden;     float: left;     width: 30%;     height: 50px;     margin: 1%;     background: orange;     color: #fff;     display: flex;     align-items:center;     justify-content:center; }  ul > li:nth-child(3n + 1):nth-last-child(3) {     background: #727272; }

you can see same in fiddle here.

now following selector:

ul > li:nth-child(3n + 1):nth-last-child(3) {         background: #727272;     }

seems selecting first element in last row, not quite understanding how ?

also 

ul > li:nth-child(3n + 1):last-child {         background: #727272;     }

does't work. why ?

i infact expect following selector select first element on last row:

ul > li:nth-child(3n + 1):nth-last-child(1) {         background: #727272;     }

so misinterpreting here , why multiple nth-child selection not work way expect ?

how trying achieve: select first element in last row .. believe have acheived , don't know how works.

this..

ul > li:nth-child(3n + 1):nth-last-child(1) {         background: #727272;     }

does not work because doesn't meet both conditions.

it's not :nth-last-child(1) , :nth-child(3n+1) isn't selected.

this works 

ul > li:nth-child(3n + 1):nth-last-child(3) {         background: #727272;     }

becuasie both li:nth-child(3n + 1) , :nth-last-child(3).

however, fact selects first element in last row purely coincidental.

css cannot detect layout. has no idea in row @ all. css selects elements , nothing else.


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