pseudo element not aligning at top left corner

Question

I'm displaying tile numbers using CSS counter and content. I want to display these number at left top corner of the tile. The following code shows it correctly in Chrome but not in FF or IE 11 (haven't checked on other browsers).

What changes do I need in CSS to consistently show the number at left top corner?

Chrome: this is how I want:

Firefox: numbers aligned to left ... but not top:

.tiles {
  /* flex properties as container (tiles level 1, 2 & 3) */
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: strech;
  align-content: strech;
  /* flex properties as content (tiles level 2 & 3) */
  flex-grow: 1;
  flex-shrink: 1;
  flex-basis: strech;
}

.tiles.level1 {
  flex-direction: column;
  flex-grow: 0;
  width: 600px;
  height: 300px;
  counter-reset: tileNum;
}

.tiles.level2 {
  flex-direction: row;
}

.tiles.level3 {
  flex-direction: row;
}

.tiles .title {
  align-self: center;
  font-size: 42px;
}

.tile {
  border: 1px solid black;
  background-color: white;
  width: 1px;
  flex-grow: 1;
  flex-shrink: 1;
  flex-basis: auto;
  /* auto = use width & height values if available */
  font-size: 24px;
}

.centerContainer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  align-content: center;
  flex-direction: row;
  flex-wrap: wrap;
}

.centerContent {
  /*	flex-grow: 1;
	flex-shrink: 1;
	align-self: center;*/
}

.tile:before {
  counter-increment: tileNum;
  content: counter(tileNum);
  align-self: flex-start;
  flex-grow: 0;
  font-size: 16px;
}

.tile:after {
  content: ' ';
  align-self: flex-end;
  flex-grow: 0;
  font-size: 16px;
}

.brand {
  text-decoration: underline;
  font-variant: small-caps;
}


  
    
			Something
    
    
      
        Something
        
        Something
        
      
      
        Something
        
        Something
        
      
    
    
      
        Something
        
        Something
        
      
      
        Something
        
        Something

Note:

I'm using flex box to display tiles and will prefer solution with flexbox only
I'm looking for CSS only solution. (I'm pretty sure that it will be possible but I'm missing out on something related to flexbox properties.)
Nesting of .tiles is needed because: I want to show 4 tiles in a row when page is viewed on PC or mobile in landscape mode but want to show only 2 tiles in a row if viewed on mobile in portrait mode. I'm OK to have some alternative for this.

Michael Benjamin · Accepted Answer

The source of the problem is align-content here:

.centerContainer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    align-content: center; <-- causing the problem
    flex-direction: row;
    flex-wrap: wrap;
}

When you tell the lines in a flex container to be centered, this collapses all extra space, packing all lines in the center of the container. That's what align-content: center does.

So your counter pseudo-element, which the browsers consider a flex item, should not move to the top of the container. The align-self: flex-start you have specified should fail to achieve your goal because the item is confined to the centered flex line, along with its siblings.

So Firefox has this right, in terms of adherence to the spec.

Chrome, as it often does (see here and here for examples), appears to be factoring in logical user behavior to improve the user experience (they call this an intervention).

Anyway, once you remove align-content: center, the stretch default value takes over again, and your flex items can move freely along the entire height of the container.

.tiles {
  /* flex properties as container (tiles level 1, 2 & 3) */
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: strech;
  align-content: strech;
  /* flex properties as content (tiles level 2 & 3) */
  flex-grow: 1;
  flex-shrink: 1;
  flex-basis: strech;
}

.tiles.level1 {
  flex-direction: column;
  flex-grow: 0;
  width: 600px;
  height: 300px;
  counter-reset: tileNum;
}

.tiles.level2 {
  flex-direction: row;
}

.tiles.level3 {
  flex-direction: row;
}

.tiles .title {
  align-self: center;
  font-size: 42px;
}

.tile {
  border: 1px solid black;
  background-color: white;
  width: 1px;
  flex-grow: 1;
  flex-shrink: 1;
  flex-basis: auto;
  /* auto = use width & height values if available */
  font-size: 24px;
}

.centerContainer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  /* align-content: center; <-- REMOVE */
  flex-direction: row;
  flex-wrap: wrap;
}

.centerContent {
  /*	flex-grow: 1;
	flex-shrink: 1;
	align-self: center;*/
}

.tile:before {
  counter-increment: tileNum;
  content: counter(tileNum);
  align-self: flex-start;
  flex-grow: 0;
  font-size: 16px;
}

.tile:after {
  content: ' ';
  align-self: flex-end;
  flex-grow: 0;
  font-size: 16px;
}

.brand {
  text-decoration: underline;
  font-variant: small-caps;
}


  
    
			Something
    
    
      
        Something
        
        Something
        
      
      
        Something
        
        Something
        
      
    
    
      
        Something
        
        Something
        
      
      
        Something
        
        Something

jsFiddle demo

For a more complete explanation, see this post:

How does flex-wrap work with align-self, align-items and align-content?

pseudo element not aligning at top left corner

Answers (2)

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