Develop Reference

Can't scroll down on first page on mobile phone, there is no scroll bar (After refreshing page it works)

i implemented a site (through small JS code) in my original website.
Everything works fine but yesterday i found out that when i first load the page, there is no scroll bar. If i refresh the page, its possible. I played a bit with the parameter 'height' but it didnt work.
Body-Code: <heyflow flow-id="erp-berater-anzeige" height="2000" width="100%" pass-parameters scroll-up-on-navigation></heyflow>
The page: https://entiac.com/erp-stellenanzeige/
PS: Im not deep into coding

I'd advise you to, first of all, add a css file or <style> tag in your index file, which will contain
body{
overflow: visible; !important
}
so you will be sure that isn't an issue. The site has some sort of scrollbar issue even on PC browser, so it would be better to set height:100%- hardcoded values like body height 2000px aren't a good solution.
Other good thing which you could do is divide your site in <section> your code </section>, give them height: 100vh; and make sure your js file loads in one of these sections. This way every section will be full height of your display (100vh = 100 view height). Such a split will make your site bit easier to manage.
Cheers!

Chrome - background-size: cover;-based gallery causes performance issues

I'm building an app using Vue 2. There's a page that contains a simple image gallery that contains about 20 images and one large page background image.
The background image of the page itself is actually contained in a fixed div element that is position: fixed;, has 100% width and height and uses background-size: cover; to display the image.
All of the ~20 items in the gallery as well are using div elements with background-size: cover; displayed in a 3-column grid and the images are displayed using the dynamically generated background-url CSS property using a Vue computed property. The image paths are never being changed so they aren't being recomputed constantly AFAIK.
The performance of this page in Chrome is abysmal, loading takes forever (those are some high resolution images, though, 4K in width) and once the images are loaded I can somewhat interact with the page but everything is extremely laggy and sometimes the page stops responding completely.
On the other hand, in Firefox and Edge everything is basically buttery smooth, both during the loading of the images and during the scrolling/rendering. The interaction with the app is never blocked.
What I remember trying to fix this is replacing the div elements with regular img tags and loading up images using those. Also, I've tried caching the images, I've tried using static image URLs for testing purposes - the same thing happens every time - other browsers handle it well, Chrome is choking on it.
Here's a screenshot of the performance summary in ~30 seconds, from the moment I click the page URL to the moment that basically everything is loaded and the browser is still struggling to render anything and process any interaction with the page. Obviously the painting phase is an issue here:
Any advice? Thanks!

This question is hard to answer as it is a very specific problem.
You can analyze what is causing this behaviour in chrome by using the developer tools:
Open the developer tools in chrome by pressing "Ctrl+Shift+I".
Go to the tab "Performance".
Hit the record button and do the action which has low performance.
Hit stop and you get a breakdown what happened in the background.
If you don't find the issue with above suggestion, you can post a detailed screenshot of the performance breakdown here, I might be able to help you with it.

Prevent iframe from loading responsive design

My app has a functionality that loads another route in a iframe. The intention is to change some layout settings, colors etc and see how that page will look in the browser in its final and original version (100% in a desktop or laptop).
The problem is that the iframe is loaded in a div that has something like 2/3 of the system's width (it's a Bootstrap column). This is smaller than our media-query breakpoint and the iframe content is loading the responsive design. But that breaks the rule in paragraph one.
I needed it to be a miniaturized version of the original page.
Is there a way to achieve this result?
What I am trying to do is somehow similar to this on Google's PageSpeed:
https://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Fstackoverflow.com%2F&tab=desktop
THe difference is that Google takes a picture and in my app the user must be allowed to interact with the page, browse other links, click buttons etc. It is a screen simulator/previewer but not responsive.

As CBroe mentioned, the problem is that the CSS for the page loaded within the iframe is using the size of the iframe as it's viewport size. You'll want to size the iframe according to how you want the actual page to display (1200px wide, for example) then use a scale transform to reduce the size of the iframe.
Your HTML could look like:
<iframe width="1200" height="600" src="https://example.com"></iframe>
Then rescale using CSS:
iframe {
transform: scale(0.3);
transform-origin: top left;
}
Here's a live example: https://codepen.io/JoshuaToenyes/pen/gMMLze

Multiple iFrames on site, all resize to a default height

I'm sorry if this question has been already answered, but can't narrow down or ask the question right.
Here goes, I have a client's website that has three embedded iFrames,the website is for Holiday accommodation and uses a Calendar, Booking Enquiry and the floorplans, all come from different vendors.
The problem is they all have different widths and height.
The width in most instances is set to 100% that's fine, but the height is where the problem is, even if I try to set the height to what I want it, it defaults back to a set size.
The default size is 309px and is in two css files needed for the site in general.
Is there a little snippet of code that could over ride that size set in the CSS?
The site in question is here: http://aalen.com.au/aalen1-pims.php
The main area of concern is the Floor plans, they just end up in a smaller iFrame and doesn't show off the potential of those plans. Many thanks

Looking at the page, I can only see one CSS file affecting your iframe, app.css, there are other css files, but none of them change the height of the element.
I assume you're referring to this code from your website.
<iframe frameborder="0" height="400" scrolling="no" src="http://pl.an/aalen-1/embed" width="100%"></iframe>
It looks like you're setting the height in two places, once in app.css with the code:
iframe{
height:390px;
text-align: center;
}
You are also setting the iframe height with the height attribute as seen in the first code example. Try removing the height="400" attribute from your iframe tag and only have the height in the app.css file.
In future you can try using the Firefox developer tools or Chrome developer tools to manipulate the CSS on the page while it is open, in order to see what you need to change, and how it will affect the rest of the content on your page.

galleria javascript crops topand bootom of images when viewing in Firefox Chrome and IE

galleria javascript crops top and base of images when viewing in Firefox Chrome and IE
However in Safari this issue does not exist.
Please see the issue here
http://galleria.aino.se/media/galleria/src/themes/fullscreen/fullscreen-demo.html
no compare the squirrel image with its original
right click on any image and you will see how the script is not displaying the the full image.
We are using galleria. js full screen for a wordpress theme and all our images are the same size so there is no height issue the images we will use are 1600x900
If any one can help please advise. We need to display the entire image.
Thanks all.

I believe that's how galleria is supposed to behave. In full screen mode it fills the screen, so it will crop the top or sides, whichever extends beyond the aspect ratio of the browser window.
In full-screen mode, if you have a wide browser window, it'll crop the top/bottom. If you resize the browser window to portrait orientation, it'll crop the left/right.

You can control this behavior using the image_crop option.
F.ex if you want the image to always fit, set this to false.

Try to set in your css:
.galleria-image img {max-width:6000px !important;}
this works for me, I think there is some trouble in Safari with the attribute max-width of the image. You could use this simple trick or improve this technique adding some conditional css, so for example setting max-width to a specific value only when option "imageCrop" of galleria is set to true. Let me know if this works also for you!