CODEWITHSUNDEEP
cssmeasurement
barakuda28
barakuda28

Reputation: 2902

Font size relative to the user's screen resolution?

I have a fluid website and the menu is 20% of its width. I want the font size of the menu to be measured properly so it always fits the width of the box and never wrap to the next line. I was thinking of using "em" as a unit but it is relative to the browser's font size, so when I change resolutions the font size stays the same.

Tried also pts and percentages. Nothing works as I need it...

Give me a hint of how to proceed, please.

Upvotes: 130

Views: 336093

Answers (12)

pavan kumar
pavan kumar

Reputation: 575

<script>
function getFontsByScreenWidth(actualFontSize, maxScreenWidth){
     return (actualFontSize / maxScreenWidth) * window.innerWidth;
}

// Example:
fontSize = 18;
maxScreenWidth = 1080;
fontSize = getFontsByScreenWidth(fontSize, maxScreenWidth)

</script>

I hope this will help. I am using this formula for my Phase game.

Upvotes: 0

Zachary Dahan
Zachary Dahan

Reputation: 1499

Using viewport units + clamp() to stay fluid, but with a defined min/max

Using viewport units alone didn't work for me because, in the ages of ultra-wide screens, relying solely on viewport units could break the design with overly huge fonts.

So, why not use the clamp() CSS function?

clamp(1.8rem, 2.5vw, 2.8rem);

This function lets you define a min (1.8rem) and max (2.8rem) constraint on the desired dynamic size you can specify in viewport units. (2.5vw)

In 2023, this function is broadly supported by most browsers.

Source: MDN. Also an extensive article on CSS-Tricks to a more complete solution handling some edge cases.

Upvotes: 4

Itai Noam
Itai Noam

Reputation: 4165

Not using media queries is nice because it allows scaling the font size gradually.

Using vw units will adjust the font size relative to the view port size.

Directly converting vw units to font size will make it difficult to hit to the sweet spot for both mobile resolutions and desktop.

I recommend trying something like:

body {
  font-size: calc(.5em + 1vw);
}
Almost before we knew it, we had left the ground.

Credit: CSS In Depth

Upvotes: 15

Collin
Collin

Reputation: 454

This best worked for me like this (where .5 is the font size scaling factor)

font-size: calc(.5 * (1.5vh + 1.1vw));

Since screens are generally more wide than they are tall, I used a 1.1:1.5 ratio.

I noticed that when I use this formula the font size stays exactly the same no matter what level of zoom I use.

Upvotes: 3

aWebDeveloper
aWebDeveloper

Reputation: 38402

New Way

There are several ways to achieve this.

*CSS supports dimensions that are relative to viewport.

  1. 3.2vw = 3.2% of width of viewport

  2. 3.2vh = 3.2% of height of viewport

  3. 3.2vmin = Smaller of 3.2vw or 3.2vh

  4. 3.2vmax = Bigger of 3.2vw or 3.2vh

    body
{
    font-size: 3.2vw;
}

see css-tricks.com/.... and also look at caniuse.com/....

Old Way

  1. Use media query but requires font sizes for several breakpoints

     body
 {
     font-size: 22px; 
 }
 h1
 {
    font-size:44px;
 }

 @media (min-width: 768px) 
 {
    body
    {
        font-size: 17px; 
    }
    h1
    {
        font-size:24px;
    }
 }

  2. Use dimensions in % or rem. Just change the base font size everything will change. Unlike previous one you could just change the body font and not h1 everytime or let base font size to default of the device and rest all in em.

  • “Root Ems”(rem): The “rem” is a scalable unit. 1rem is equal to the font-size of the body/html, for instance, if the font-size of the document is 12pt, 1em is equal to 12pt. Root Ems are scalable in nature, so 2em would equal 24pt, .5em would equal 6pt, etc..

  • Percent (%): The percent unit is much like the “em” unit, save for a few fundamental differences. First and foremost, the current font-size is equal to 100% (i.e. 12pt = 100%). While using the percent unit, your text remains fully scalable for mobile devices and for accessibility.

see kyleschaeffer.com/....

Upvotes: 105

Alexandra
Alexandra

Reputation: 41

This worked for me :

body {

  font-size: calc([minimum size] + ([maximum size] - [minimum size]) * ((100vw - [minimum 
viewport width]) / ([maximum viewport width] - [minimum viewport width])));

}

Explained in detail here: https://css-tricks.com/books/volume-i/scale-typography-screen-size/

Upvotes: 4

Arpit Srivastava
Arpit Srivastava

Reputation: 2235

@media screen and (max-width : 320px)
{
  body or yourdiv element
  {
    font:<size>px/em/rm;
  }
}
@media screen and (max-width : 1204px)
{
  body or yourdiv element
  {
    font:<size>px/em/rm;
  }
}

You can give it manually according to screen size of screen.Just have a look of different screen size and add manually the font size.

Upvotes: 54

Elad Ziv
Elad Ziv

Reputation: 201

I've developed a nice JS solution - which is suitable for entirely-responsive HTML (i.e. HTML built with percentages)

  1. I use only "em" to define font-sizes.

  2. html font size is set to 10 pixels:

    html {
  font-size: 100%;
  font-size: 62.5%;
}

  3. I call a font-resizing function on document-ready:

// this requires JQuery

function doResize() {
    // FONT SIZE
    var ww = $('body').width();
    var maxW = [your design max-width here];
    ww = Math.min(ww, maxW);
    var fw = ww*(10/maxW);
    var fpc = fw*100/16;
    var fpc = Math.round(fpc*100)/100;
    $('html').css('font-size',fpc+'%');
}

Upvotes: 20

Miljan Puzović
Miljan Puzović

Reputation: 5820

You can use em, %, px. But in combination with media-queries See this Link to learn about media-queries. Also, CSS3 have some new values for sizing things relative to the current viewport size: vw, vh, and vmin. See link about that.

Upvotes: 69

Domenico Monaco
Domenico Monaco

Reputation: 1236

I've created a variant of https://stackoverflow.com/a/17845473/189411

where you can set min and max text size in relation of min and max size of box that you want "check" size. In addition you can check size of dom element different than box where you want apply text size.

You resize text between 19px and 25px on #size-2 element, based on 500px and 960px width of #size-2 element

resizeTextInRange(500,960,19,25,'#size-2');

You resize text between 13px and 20px on #size-1 element, based on 500px and 960px width of body element

resizeTextInRange(500,960,13,20,'#size-1','body');

complete code are there https://github.com/kiuz/sandbox-html-js-css/tree/gh-pages/text-resize-in-range-of-text-and-screen/src

function inRange (x,min,max) {
    return Math.min(Math.max(x, min), max);
}

function resizeTextInRange(minW,maxW,textMinS,textMaxS, elementApply, elementCheck=0) {

    if(elementCheck==0){elementCheck=elementApply;}

    var ww = $(elementCheck).width();
    var difW = maxW-minW;
    var difT = textMaxS- textMinS;
    var rapW = (ww-minW);
    var out=(difT/100)*(rapW/(difW/100))+textMinS;
    var normalizedOut = inRange(out, textMinS, textMaxS);
    $(elementApply).css('font-size',normalizedOut+'px');

    console.log(normalizedOut);

}

$(function () {
    resizeTextInRange(500,960,19,25,'#size-2');
    resizeTextInRange(500,960,13,20,'#size-1','body');
    $(window).resize(function () {
        resizeTextInRange(500,960,19,25,'#size-2');
        resizeTextInRange(500,960,13,20,'#size-1','body');
    });
});

Upvotes: 1

user3334188
user3334188

Reputation: 187

Not sure why is this complicated. I would do this basic javascript

<body onresize='document.getElementsByTagName("body")[0].style[ "font-size" ] = document.body.clientWidth*(12/1280) + "px";'>

Where 12 means 12px at 1280 resolution. You decide the value you want here

Upvotes: 7

CoderJK
CoderJK

Reputation: 269

You might try this tool: http://fittextjs.com/

I haven't used this second tool, but it seems similar: https://github.com/zachleat/BigText

Upvotes: 4

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