What does a class overflow do [closed] - html

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I have no HTML or CSS experience but trying to figure out what exactly this line of code means
<div class="overflow-100">
It has an affect on how wording appears on our portal and not sure if it's limiting words to 100 characters, 100 pixels or something else

Answer 1

overflow-100 is a user defined class that css selectors can target. Without seeing selector/s targeting overflow-100 we have no idea what declarations it applies. Open the document in the browser, open dev tools (f12), inspect element (ctrl+shift+c) and hover over the div with the class overflow-100. In the styles tab find a rule with a selector overflow-100 and you will see css declarations it applies. Googling for those rules will give you a understanding of the effects of the overflow-100 class.

Answer 2

Class names are purely user data. Neither HTML nor CSS assign any special meaning to them so they don't accomplish anything by default.
Their purpose is to assign custom information that can be leveraged later from other tools (JavaScript, CSS, accesibility tools, web crawlers...).
Here's a quick and dirty showcase:
document.querySelectorAll("div").forEach(function(box){
box.classList.forEach(function(className){
let fragments = className.split(/^foo-(\d+)$/);
if (fragments.length === 3) {
box.innerHTML += ` <strong>Type ${fragments[1]}</strong>`;
}
})
});
div {
border: 1px solid orange;
}
.foo-100 {
width: 100px;
}
.foo-200 {
width: 200px;
}
<div class="foo-100 something-else">Hello, World!</div>
<div class="foo-200">Hello, World!</div>
To help figure out what your application is currently doing with them you can use the browser developer tools. For instance, here:
document.querySelectorAll("div.bar").forEach(function(box){
addEventListener("click", function(){
alert("You've clicked on bar");
})
});
div.bar {
color: green;
}
<div class="foo">Hello, World!</div>
<div class="bar">Click me!</div>
... you learn you have an event listener and an inline style (please note anyway that this example is an Stack Overflow snippet, which is more complex that regular code):