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QUESTION
I'm using CSS to style some existing documents, and using a lot of adjacent sibling selectors (e.g. item1 + item2) to apply spacing, etc. between elements. However, many of the documents also include
Yellow
Green
Green
Green
Green
...ANSWER
Answered 2021-Apr-30 at 07:28Margins can get complicated as document layouts get more complex, but for simplicity's sake this answer will assume you only have to worry about lobotomized owls, and documents with relatively simple block layouts in which margins collapse between parents and children, so we can focus on the selectors at hand.
The following selector is robust to any number of element types and any nesting depth (i.e. not just children of body
). Unfortunately it does involve repeating the same compound selector:
QUESTION
I have a website that I designed based on the "Holy Grail" layout described in this A List Apart post. A recent Chrome update broke it. You can see the results on the example page for the article (I also made it into a fiddle). Open it in Firefox to see what it should like and in Chrome to see what's happening now.
I realize that this technique is super dated, and I have plans in place to redesign it with Flexbox. But, that will take time, and I was hoping to get it working again quickly in the meantime while I work on a redesign. You can read more about LayoutNG on this page.
Does anyone know any tips and tricks to fix this? Is there a Chrome bug already open that I can follow?
Update: I decided to test it in Canary (v79), and the layout works perfectly there. It's still broken in Beta though (v78). So, I could wait until the current Canary gets released, but that won't be until December according to current estimates. So, I would still like to find a quick fix between now and then if one is available.
Here's some code to make SO happy:
...ANSWER
Answered 2019-Oct-02 at 23:36It turned out to not be that hard to reimplement the layout with Flexbox. So, I just did some good old fashioned user agent sniffing to detect broken Chrome versions and load a small CSS snippet to override the appropriate styles.
QUESTION
I try to build a pure CSS tree. I encountered a problem with horizontal lines between blocks (two blocks are at the same level). I isolated the problem in the following jsfiddles:
https://jsfiddle.net/8Lsv1ypd/3/
https://jsfiddle.net/8Lsv1ypd/4/
Html :
...ANSWER
Answered 2019-Mar-06 at 11:44When the CSS position (in .second::before) is set to relative, the width (fixed in pixels) is not considered, only the vertical line is displayed and width is "forced by the browser" to 1 pixel.
A pseudo element is an inline element by default, setting position:relative
will not change this thus you cannot apply width and height to the element. Then the borwser is not forcing the width to 1px
, it's the border you have set that is equal to 1px
. The height also isn't working and the height of the element and the border is defined by the font property.
Increase the height and you will see that nothing will change:
QUESTION
Many websites write code that have broken the ability for users to set their own font size (in the settings of the browser/mobile). In order to avoid this, what exactly happens on a technical level when the user changes the default font size? What does it affect?
- the
html
root elementfont-size
that is specified in CSS? Does it scale or override this? - the units
em
,px
,rem
, %? - what about other units, like
vh
,vw
,vmin
,vmax
for those that are trying to do fluid typography? - how will this affect
calc()
? - is the behavior the same for mobile devices?
However, none of the below refer to specifications, but are just collections of specific behaviors.
- From my own experiments, setting
font-size
forhtml
with a % does scale when the user changes the browser font size. - This answer has some information, seeming to say that when
html
is set,px
doesn't adjust, butem
,rem
, % do. - This site has some really good info, but it is all a decade old and uncertain if the behavior mentioned is just because of browser bugs or if it's designed that way.
- There is a lot of sloppy language that people use when talking about this. For example, people will talk about the 'base font size', but not specify if this is the font specified in the root/
html
element, the browser settings, or the combination of the two. I'm sure it's clear to those who already know the interactions, but to me I still have the concepts unclear.
ANSWER
Answered 2018-Dec-18 at 06:58The user-defined font size determines the base font size of the root element html
. The initial value of font-size
as specified by CSS is medium
, which in all desktop browsers corresponds to this user-defined size (except Microsoft Edge which follows Windows DPI and accessibility settings rather than having its own). Mobile browsers don't seem to honor the system-wide preference typical of mobile devices, unfortunately. At least, none of Safari on iOS, Internet Explorer on Windows Phone 8.1 or Microsoft Edge on Windows 10 Mobile do.
All other keyword values of the font-size
property defined here are scaled to this size, so if the user-defined size is 20px, medium
corresponds to 20px and small
will almost certainly correspond to a size smaller than 20px.
Media query rems and ems are calculated directly off of this user-defined size, irrespective of the specified font-size
property of the root element. Each of the following media expressions:
QUESTION
In mozilla's doc for feColorMatrix it is stated that
The SVG filter element changes colors based on a transformation matrix. Every pixel's color value (represented by an [R,G,B,A] vector) is matrix multiplied to create a new color.
However in feColorMatrix
there are 5 columns, not 4.
In an excellent article that can be considered as a classical reference it is stated that:
The matrix here is actually calculating a final RGBA value in its rows, giving each RGBA channel its own RGBA channel. The last number is a multiplier.
But that does not explain a lot. As far as I understand, since after applying filter we basically modify exactly R, G, B and A channels and nothing else there's no need in this additional parameter. Indirectly there's an evidence for that in the article itself - all numerous examples of feColorMatrix-based filters provided - all have zeroes as fifth component. Also, why it's a multiplier?
In another famous article it is stated that:
For the other rows, you are creating each of the rgba output values as the sum of the rgba input values multiplied by the corresponding matrix value, plus a constant.
Calling it a constant added makes more sense than calling it a multiplier, however it's still unclear what does fifth component in feColor matrix stands for and what is unachievable without it - so that would be my question.
My last hope was the w3c reference but it's surprisingly vague as well.
...ANSWER
Answered 2018-Sep-26 at 22:53The specification is clear although you do need to understand matrix math. The fifth column is a fixed offset. It's useful because if you want to add a specific amount of R/G/B/A to your output, that column is the only way to do it. Or if you want to recolor something to a specific color, that's also the way to do it.
For example - if you have multiple opaque colors in your input, but you want to recolor everything to rgba(255,51,0,1) then this is the matrix you would use.
0 0 0 0 1.0
0 0 0 0 0.2
0 0 0 0 0
0 0 0 1 0
aka
QUESTION
I have a textarea
with a specific minimum height and based on this article I made it expandable. The problem is that it expands before it fills its minimum height,so I want it first to fill its given height and then expand.
here is a fiddle
And here is the code:
HTML:
...ANSWER
Answered 2017-Aug-14 at 08:08The observed issue that the textarea expand ahead of the input is because you have not reset the margin of the
QUESTION
I hear that creating a single layout page helps maintainability, I am new and about to implement this but am confused about something. If am correct, a file will serve as the layout file requiring header.php and footer.php, and all request to the server will have to pass through this one file, I also learnt from https://alistapart.com/article/succeed that redirecting to this layout page will require editing the .htaccess file. My question is what if I don't want to edit the .htaccess file and include a code in all my content pages to redirect all request to the layout file?
...ANSWER
Answered 2017-Jun-21 at 22:41I don't recommend this approach, but I think what you're looking for is this:
On every page, immediately start out with output buffering. When you're done with your page, capture the output buffer in a variable. Turn off output buffering, then include your "layout" page that prints out that variable in between your header and footer HTML.
You'd be better served to learn mvc, though.
To find info on buffering, go to php site and look up ob_start.
QUESTION
I am trying to get my sub-menu to appear above my body div when hovering over menu. Here is a picture of my problem since the website is not live yet.
I have been messing around with this for a while now and can't seem to figure out what I have to do to get it to work. I have a z-index value for my sub menu but it still won't show. How can I get the menu to show above the body div?
...ANSWER
Answered 2017-Feb-14 at 18:22Just change overflow: hidden
to overflow: visible
in #header
QUESTION
I have tried adapting this post and its alistapart links. But I can't get my three blocks in a container to act responsively and maintain their aspect ratio
...ANSWER
Answered 2017-Jan-19 at 11:36I've removed those extra colors and simplified the percentages to simplify the code.
The idea is that I've added position: relative;
to the parent and position: absolute;
to the children. This ensures that the children positions are bounded to the parent.
I've also added top: 0; bottom: 0;
to the children, to make the children span
spans the height as the parent div
.
Then you have to place the spans in the correct places by using left
and right
positioning.
QUESTION
I do not understand why this code
...ANSWER
Answered 2017-Jan-08 at 16:15Well, the main problem is poorly-crafted, non-compliant HTML at the site that prides itself on actually being smarter than everyone else in that regard.
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