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JavaScript DIV Editing Destroys Functionality of Other Elements

So my website is built using a company's software called Inksoft which leaves me very little to work in the way of customization. So I have to do many workarounds.
Here is my site's homepage.
The header on top of the page only has two links right now. "Products" and "Design Studio". My goal is to add an "About Us" link and "Buyers Guide" to the header as well.
I cannot add new content to the header using Inksoft's backend. So I coded a workaround to replace the content of existing DIV's within the header to say and link to where I want them to go.
The only issue is, the responsive mobile-nav loses functionality when this is implemented. As seen here on this test page.
The test page has the About Us in the top header, added by the use of this code:
<script>
$("#header-nav-designs").html('<document.write="<li id="header-nav-studio"><font color="#000000">About Us</font></li>');
</script>
So, the simplified question is: how do I implement this code without losing the responsive functionality of the nav bar?

The jQuery .html function will replace the HTML inside the target element. If you want to just append the one value, you likely want to .append to the element.
In addition, you aren't setting the HTML to a valid html string. You probably just want to get rid of the <document.write=" at the beginning of the string. The rest of it looks fine with just a cursory glance.
So:
<script>
$("#header-nav-designs").append('<li id="header-nav-studio"><font color="#000000">About Us</font></li>');
</script>
Edit:
After looking at it a little more, it appears as though the $('#header-nav-designs') that you are selecting is already an <li> which means you need to either select the parent <ul> list or you can use the jquery .after function instead.
<script>
$("#header-nav-designs").after('<li id="header-nav-studio"><font color="#000000">About Us</font></li>');
</script>
And as someone else commented above, you are getting an error on the page. It appears as though you are trying to get an element with the id divID and the appending some html to it, but there is no element with the id divID and so you are getting an error saying that you can't read the property innerHTML of null as the call to document.getElementById is returning null (element not found).

Element id header-nav-designs witch your code is referring have CSS style on line 170:
#header-nav-designs {display:none;}
The element will be hidden, and the page will be displayed as if the element is not there. With display:none;
If I understand you correctly your code selector points to wrong element id. It should point $(".header-nav > ul"). Document.write is not needed inside jQuery you need to give only an valid html string as argument.
jQuery html function erase html that is all ready inside element and replace it with html string given as argument. You have to use append if you want to add more html but not remove what is allready in element.
$(".header-nav > ul").append('<li><font color="#000000">About Us</font></li>');
$(".header-nav > ul").append('<li><font color="#000000">Buyers Guide</font></li>');

Need help to find id of a specific element (external) to override styling by CSS

I'm trying to modify (by CSS) the dark gray "Contact Us" button that's at the bottom right side of the following site: coloraddicted.com.
This is a button created by an external app, so the code is inaccessible. I only have the following (external) page to refer to for the possibility of finding the right id: https://icf.improvely.com/icf-button.js?v=1479350309&shop=coloraddicted-com.myshopify.com
How can I find the "id" of the specific element in order to apply the
"overriding" CSS to it?
BTW, I have already tried several versions of the id's I see on the above mentioned external page but still haven't found the right one.
I can't remember all of them, but some I have already tried are:
#icf_button
#icf.click_button
#icf_contact_form button {
#icf_contact_form add_button {

Style Contact button by css has no effect, because right after user hover, js code excuted & override on.
You can put js code at the end of the body, to re-override on the library code (not the good way, but have to), example
let contactButton = document.querySelector('#shop-colorful-products-printed-on-demand-just-for-you > div:nth-child(38)');
contactButton.style.backgroundColor = 'white';
Demo image https://tinker.press/images/change-style-by-js-to-override-2017-01-17_090946.png

If you can't modify the button.js script you linked to, I don't think you can target this (reliably) in CSS. They style everything with that button using inline styles and just append it to body.
You could potentially use :nth-of-type (like https://icf.improvely.com/icf-button.js?v=1479350309&shop=coloraddicted-com.myshopify.com) but that would be super unreliable as I'm assuming you have a bunch of scripts and stuff on the site that dynamically append to the page, creating a variable number of divs as direct descendants of body. FWIW, nth-of-type(13) worked for me.

The element doesn't have an id, so you can't select it that way. But the site appears to be using jQuery, so you could try using :contains() to target the element based on its contents:
$( "div:contains('Contact Us')" ).css( "font-size", "2em" );
But that would target any div containing the text "Contact Us". You can use :filter to select divs that contain only the text "Contact Us":
$("div").filter(function() {
return $.trim($(this).text()) === "Contact Us";
}).css("font-size", "2em");
You could use jQuery to either apply CSS directly, or to give the element an id. This solution is kind of kludgy, but might work in a pinch.

Using inline style with jQuery appended element

I'm writing a user script in Greasemonkey and I am currently adding elements to a text box. I have tried unsuccessfully to use inline CSS within the created element like so
CSS
.append($("<p style="color:blue">"))
Is this even possible to do with jQuery? I couldn't find any examples of this searching around and I'm still really new to coding, so I apologize if this has been answered before.

Supposing you want to append a inline-styled <p> tag to a <div> tag you have to use:
var parentNode = $('div');
var childNode = $('<p>');
childNode.css('color', 'blue');
parentNode.append(node);

The last post asking really well to question but your first approach works also (you just forget the '/' at the end).
Supposing you want just adding a simple "p" empty element, you can just do this (with Jquery):
$(element).append('<p style="color:red" />')
or if you want to add a p no empty element do this :
$(element).append('<p style="color:red" > My text </p>')
It's the shortest way to do that but the last post show a more cleaning technic to do that.

jQuery append text formatting

This question is not related to coding issues but how we write our codes. For example take the append function. When we use jQuery append to insert long divs, it is easy to lose track of it's correctness. Example:
$('#someDiv').append('<div><span><div> .............. hundreds of div here ..... </div></span></div>');
Is it possible to convert this to a readable format, for example using multi-lines. I tried
$('#someDiv').append('<div>'+
+'<span>'+
+'<div> ...... and you get the point')
This doesn't seem to work. This question may be easy for some but it is not so obvious for me. Also although I minify js files at the end, it would be nice not to lose track of the elements while writing the code.

If you have to add the HTML inline style I would suggest the following format.
var html =
'<div class="somediv">\
<div class="otherdiv">\
.
..
...
</div>\
</div>';
$('#somediv').append(html);

You can do it this way -
$('#someDiv').append($('<div>').append($('<span>'))
.append($('<div>'))
.append($('<div>'))
.append($('<div>'))
.append($('<div>'))
)
You can also add css styles, add class, change html while appending these html elements (wrapped in jQuery object)
$('<div>').css('color','red')
$('<div>').addClass('someClass')
$('<div>').html("and you get the point")

My solution would be to create all these elements
div1 = $(document.createElement('div'));
div1.attr(..);
div1.css(..);
container.append(..)
This means a lot of code but you can outsource it, can easily change attributes and its good readable...

ckeditor setdata only using some of the HTML Loaded [duplicate]

I have been using CKEditor for some time and it has worked great. I've pretty much gotten rid of any problems that ive had but this one i cant seem to figure out. When i add inline attributes to elements for instance style = "color: #ff0;" on a <p></p> tag they are stripped out when i switch from wysiwyg to source view. No saving or submission is done and ckeditor is has been added to my site which is my own script. Any ideas as to what would cause this. All of the search results i can find correspond to this happening in Drupal but Drupal seems to be the problem not the editor in all instances. Thanks again!

It feels like you're using CKEditor 4.1+ that comes with Advanced Content Filter (ACF). If so, you need to specify config.allowedContent and configure it to get your things working. You may also be interested in config.extraAllowedContent.
See this answer for more details.

For anyone looking for a simple sample on how to enabled additional markup in CKEditor without disabling ACF completely, here is a short snippet:
CKEDITOR.replace( 'editor1', {
extraAllowedContent: 'style;*[id,rel](*){*}'
} );
extraAllowedContent here enables the <style> element, allows two additional attributes (in square brackets) for all (* is a wildcard) already allowed elements, allows usage of any class names (*) for them and allows usage of any inline styles {*}

hi you can stop ACF easily . by default your configaration is---
function ckeditor($name,$value='',$height=300){
return '<textarea name="'.addslashes($name).'">'.htmlspecialchars($value).'</textarea>
<script>$(function(){CKEDITOR.replace("'.addslashes($name).'",{});});</script>';
}
just add this in the curly brackets:
allowedContent: true
now your configuration will be:
function ckeditor($name,$value='',$height=300){
return '<textarea name="'.addslashes($name).'">'.htmlspecialchars($value).'</textarea>
<script>$(function(){CKEDITOR.replace("'.addslashes($name).'",{allowedContent: true});});</script>';
}

I faced the same issue and below answer solved my problem:
config.allowedContent = true;
config.extraAllowedContent = '*(*);*{*}';
config.extraAllowedContent = 'span;ul;li;table;td;style;*[id];*(*);*{*}';

I had the same problem, that ck was stripping not only some attributes, but whole elements when pasting a block element, inside a block element (div with some attributes pasted inside a p) while using this method:
editor.insertHtml(html);
what solved the problem was using this workaround instead:
editor.insertElement(CKEDITOR.dom.element.createFromHtml(html));