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Javascript event when first accessing the website

this is a pretty simple question in theory, but i can't seem to find an answer: is there such a thing as an event for when a user first accesses a website ? something like onload, but for the whole website, not for a single page.

basically i'm writing a website in Python Flask with Jinja. part of the website retrieves information from wikipedia, which slows the website a lot. so i added a toggle switch to activate / deactivate the wikipedia bit.

however, i can't seem to find a consistent way to define a default value for the button (when accessing the website, wikipedia enhancements are activated) while also keeping the button's value when navigating through the website (the button's value doesn't change unless you tell it to).

everything else works fine: toggling wikipedia enhancements on and off... i'm using Flask and Jinja, so if you have an idea using that, it's fine to !

here's the html button:

<label class="toggle" id="wikitoggle">
   <input type="checkbox" value="active"/>
   <span class="slider"/>
   <span class="labels">Wikipedia</span>
</label>

and here's the javascript:

var wiki = document.querySelector("#wikitoggle input");

function wikiToggle() {
   if (wiki.getAttribute("value") === "inactive") {
       wiki.setAttribute("value", "active");
   } else {
       wiki.setAttribute("value", "inactive");
   };
   
   var data = {"wikistatus": wiki.getAttribute("value")};
   
   $.ajax({
      type: "GET",
      url: "/wikistatus",
      data: data,
      dataType: 'json',
   });
};

basically i set the value of an attribute and launch an asynchronous request to a flask route.

thanks !

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