4.1.2 breaks alignment of inline SVG icons

[nifte]

A new change in 4.1.2 causes inline SVG icons to become unaligned.

The code in question, /scss/_reboot.scss, line 277:

svg:not(:root) {
    overflow: hidden;
    vertical-align: middle; <--- (Line 277)
}

The issue can be seen in the following examples:
Version 4.1.1 (Icons aligned)
Version 4.1.2 (Icons not aligned)

[mdo]

Ah, yes, the selector is too strong and overrides classes.

[ysds]

Removing :not(:root) and overflow: hidden; is a solution?

svg {
  vertical-align: middle;
}

Because,

svg:not(:root) {	
  overflow: hidden;	
}

is for IE9, so we can remove it.
ref: necolas/normalize.css@004d58b#diff-04c6e90faac2675aa89e2176d2eec7d8L73

And...

svg:not(:root) {
  vertical-align: middle;
}

SVG can be the root element, but I'm not sure you need :not(:root). Even if that is the root, I don't think that vertical-align: middle will cause something.

[mdo]

Yup, I agree with that. Feel free to open a PR @ysds, or I can later this week. Hoping to do a 4.1.3 next week to fix some issues.

[ysds]

@mdo sure. Which is preferred?

img {
  vertical-align: middle;
  border-style: none; // Remove the border on images inside links in IE 10-.
}

svg {
  vertical-align: middle;
}

or

img, svg {
  vertical-align: middle;
}

img {
  border-style: none; // Remove the border on images inside links in IE 10-.
}

[MartijnCuppens]

I would say option 1?

[ysds]

I found @XhmikosR 's comment #26296 (comment) and https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7226597/.

Unfortunately, that bug still exists in IE11. I don't have a environment to test with IE10.

https://codepen.io/anon/pen/pZNaqN

[Herst]

@ysds

is for IE9, so we can remove it.

It is not only for IE9, it is necessary for all IE versions.

[ysds]

@Herst Looks like it :)

[MartijnCuppens]

Is there any reason why we add :not(:root)? We can just leave that out and specificity problem is solved? Just add overflow: hidden to all svg? And as @ysds pointed out:

SVG can be the root element, but I'm not sure you need :not(:root). Even if that is the root, I don't think that vertical-align: middle will cause something.

This demo works in IE10 and IE11: https://codepen.io/MartijnCuppens/pen/QBGoKd?editors=1100

[ysds]

Is there any reason why we add :not(:root)?

Yeah, I have the same doubt. I can not imagine the scenario where Bootstrap is used in SVG documents. like:

<svg xmlns="http://www.w3.org/2000/svg">
  <style>
    @import url(bootstrap.css);
  </style>
  <rect .../>
</svg>

ref: https://www.w3.org/TR/SVG2/styling.html#LinkElement

or

<svg xmlns="http://www.w3.org/2000/svg">
  <style>
    /*!
     * Bootstrap v4.1.2 (https://getbootstrap.com/)
     ...*/
  </style>
  <rect .../>
</svg>

@mdo Do you expect any usage that Bootstrap is used in SVG documents? If not, the :not(:root) could be remove. It is not necessary to verify and waste time.