Firefox: automatic linebreak with a sibling [float: right] element + overflowing text - html

Question

I have a problem with Firefox on a really specific graphic implementation.
I think you may understand the problem just by testing this fiddle: on firefox you'll see the problem, on any other browser you'll see the expected result (including IE9).
Design I need:
PNG illustration
I have a main block (dashed border) with a fixed width.
There is 2 lines, one above the other, within the main block. The 2 lines must be align on the right of the main block
Each line contains 2 children. The left ones have a dynamic text (gray background), the right ones are optionnals (blue background). The above right one contains an icon (orange) with a fixed width, the bellow right one is a dynamic temperature (with one decimal maximum).
Blocks are separated by a fixed 5px margin.
Texts and icon must be vertically centered.
In any case, the 2 lines need to have the same width: the smaller one takes the width of the bigger one.
If one line (or both) becomes too large for the main block, the left text (gray background) automatically linebreak.
HTML Code:
<div class="main-wrapper">
<div class="container">
<div class="content upper">
<div class="right-block"><!-- This block is optionnal -->
<div class="icon"></div>
</div>
<div class="left-block">
<div class="vertically-centered">
<p>
Some dynamic text
</p>
</div>
</div>
</div>
<div class="content lower">
<div class="right-block"><!-- This block is optionnal -->
<div class="vertically-centered">
<span>
21,5°
</span>
</div>
</div>
<div class="left-block">
<div class="vertically-centered">
<p>
Some other dynamic text
</p>
</div>
</div>
</div>
</div>
</div>
CSS Code:
/* utilities */
.vertically-centered {
display: table;
height: 100%;
width: 100%;
}
.vertically-centered > * {
display: table-cell;
vertical-align: middle;
}
/* custom styles */
.container {
display: inline-block;
float: right;
max-width: 100%;
}
.content {
width: 100%;
margin: 5px 0px;
height: 85px;
}
.right-block, .left-block {
height: 100%;
}
.right-block {
float: right;
font-size: 42px;
margin-left: 5px;
background-color: lightblue;
}
.left-block {
font-size: 25px;
line-height: 25px;
overflow: hidden;
padding: 0 20px;
text-align: left;
background-color: lightgray;
}
.upper .right-block {
width: 85px;
}
.lower .right-block {
padding: 0 15px;
}
.icon {
position: relative;
top: 20%;
left: 20%;
width: 60%;
height: 60%;
background-color: orange;
}
What I already tried:
Put a display: inline-block on the .left-block div, as suggested here, but it doesn't satisfy the need to have the same width on both lines.
Put a display: inline-block on the .content div; makes the line 100% width on other browsers, and create a big right gap within the .left-block on firefox.
Use white-space: nowrap on the .left-block; didn't help.
Make the .left-block div floating (right or left), but it doesn't work if the text is too large for the main container
And a lot of other things but not a single one compatible with all the browsers (Chrome, Firefox, Safari, IE9+, Edge)...
A precision although I don't think it will change anything: it is responsive.
I'm trying something with flexbox but... IE9... If anybody has a suggestion.

Answer 1

You can use the CSS word-break property to allow line breaks in the middle of long words:
.content {
width: 100%;
margin: 5px 0px;
height: 85px;
word-break: break-all;
}

Answer 2

I found out a solution with flexbox!
I added a display: flex to the .content div with flex-direction: row-reserve to keep the order of the element and still be able to use float: right for IE9.
In addition, there is a flex: auto property on .left-block divs to take as much space as possible (Note: IE11 needs flex-basis to be set to be able to calculate the space wanted by the flex-grow property. That's why I used auto instead of 0 on the flex property. See details)
The completed CSS code
.content {
width: 100%;
margin: 5px 0px;
height: 85px;
display: flex; /* Initialize flexbox */
flex-direction: row-reverse; /* keep the order of the element */
border: 1px dashed gray;
}
.left-block {
font-size: 25px;
line-height: 25px;
overflow: hidden;
padding: 0 20px;
text-align: left;
background-color: lightgray;
flex: auto; /* the text blocks take all the available space */
}
Here's the fiddle with the correction. Sometimes IE9 takes 2 lines of text instead of 1 (the text is 2px larger that the container, I don't know why...) but atleast it's readable!