Firefox bug: image does not scale down? - html

Question

Is this a bug in firefox?
CSS,
html, body {
height: 100%;
margin: 0;
padding: 0 0;
/*border: 4px solid black;*/
}
.container-fluid {
height: 100%;
width: 100%;
display: table;
padding-right: 0;
padding-left: 0;
/*border: 4px solid blue;*/
}
.row-fluid {
height: 100%;
width: 100%;
display: table-cell;
vertical-align: middle;
background-color:#990000;
/*border: 4px solid red;*/
}
.img-container {
height: 100vh;
width: 100%;
display: flex;
align-items: center;
}
.img-container img{
max-width:100%;
max-height:100%;
margin-left: auto;
margin-right: auto;
}
HTML,
<div class="container-fluid">
<div class="row-fluid">
<div class="img-container">
<!-- <img src="http://placehold.it/400x450"> -->
<img src="http://placehold.it/2000x450">
<!-- <img src="http://placehold.it/400x480"> -->
</div>
</div>
</div>
Chrome,
The large image will be scaled down to fit the screen width which is what I want.
Firefox,
The image is not scaled down to fit the screen.
Any ideas how I can fix this?
EDIT:
#-moz-document url-prefix() {
.img-container img {
width: 100%;
max-width: -moz-max-content;
}
}

Answer 1

Since you are using CSS table for the layout already, I'm suggesting this approach without flexbox. It works nicely on Chrome and Firefox according to my tests. I added a div around the img.
jsFiddle
body { margin:0; }
.img-container {
display: table;
table-layout: fixed; /*required for responsive width in Firefox*/
width: 100%; /*required for fixed table layout*/
}
.img-container .image {
display: table-cell;
text-align: center;
vertical-align: middle;
height: 100vh; /*required for responsive height*/
}
.img-container .image img {
max-width: 100%;
max-height: 100%;
vertical-align: middle; /*remove whitespace*/
}
<div class="img-container">
<div class="image">
<img src="http://placehold.it/400x300">
<!-- <img src="http://placehold.it/2000x450"> -->
<!-- <img src="http://placehold.it/400x480"> -->
</div>
</div>
Alternatively, you can use pseudo element :before or :after + inline block for vertical alignment. No markup change is required.
jsFiddle
body { margin:0; }
.img-container {
width: 100vw; /*required for responsive width in Firefox*/
height: 100vh;
text-align: center;
font-size: 0; /*remove whitespace*/
}
.img-container:after {
content: "";
display: inline-block;
height: 100%;
vertical-align: middle;
}
.img-container img {
max-width: 100%;
max-height: 100%;
vertical-align: middle;
}
<div class="img-container">
<img src="http://placehold.it/400x300">
<!-- <img src="http://placehold.it/2000x450"> -->
<!-- <img src="http://placehold.it/400x480"> -->
</div>

Answer 2

Yes there is problem in firefox. It will not maintaining aspect ratio. To make it working just add width: 100%; to image will solve issue.
.img-container img {
margin-left: auto;
margin-right: auto;
max-height: 100%;
max-width: 100%;
width: 100%;
}
Working Fiddle
Check same type of issue here.
Edit:
To solve issue for all size image use max-width: -moz-max-content;
#-moz-document url-prefix() {
.img-container img { width: 100%; max-width: -moz-max-content; }
}
Updated Fiddle

Answer 3

Based on a bug report (see below), this is a known issue with Firefox. (Although IE11 also fails to scale the image as desired).
This seems to solve the problem in Firefox:
Instead of:
.img-container img {
max-width: 100%;
max-height: 100%;
margin-left: auto;
margin-right: auto;
}
Try this:
.img-container img {
width: 100%; /* adjusted */
height: auto; /* adjusted */
margin-left: auto;
margin-right: auto;
}
DEMO
Another possible solution involves adding table-layout: fixed to the main container (.container-fluid). This method is detailed in this bug report:
Bug 975632 - max-width: 100%; doesn't work inside tables or display: table