Font scaling based on width of container

Question

I m having a hard time getting my head around font scaling   I currently have a website with a body font-size of 100   100  of what though  This seems to compute out at 16 pixels   I was under the impression that 100  would somehow refer to the size of the browser window  but apparently not because it s always 16 pixels whether the window is resized down to a mobile width or full-blown widescreen desktop   How can I make the text on my site scale in relation to its container  I tried using em  but this doesn t scale either   My reasoning is that things like my menu become squished when you resize  so I need to reduce the px font-size of  menuItem among other elements in relation to the width of the container   For example  in the menu on a large desktop  22px works perfectly  Move down to tablet width and 16px is more appropriate    I m aware I can add breakpoints  but I really want the text to scale as well as having extra breakpoints  otherwise  I ll end up with hundreds of breakpoints for every 100pixels decrease in width to control the text

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As a JavaScript fallback  or your sole solution   you can use my jQuery Scalem plugin  which lets you scale relative to the parent element  container  by passing the reference option

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If the issue is font getting too big on widescreen desktop  I think the easiest CSS method would be something like this  assuming wrapper maximum 1000 pixels wide    specialText      font-size  2 4vw      media only screen and  min-width  1000px         specialText           width  24px            So it is auto sized for any screen smaller than the maximum width of your container  and fixed size when the screen is wider  like virtually all desktop and laptops

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I just created a demo how to do it  It uses transform scale   to achieve that with some JS that watches element resizing  Works nicely for my needs

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I was very frustrated trying to achieve a fitty-like tight text wrapping so I ended up using a canvas-based method which I arrived at by unsuccessfully trying other methods  What I was aiming for looks like the attached which turns out to be surprisingly difficult  for me   Hopefully one day we will have a simple CSS-only way of doing this  Downsides of this approach is the text is treated more like an image  but for some use cases this is fine  https   codesandbox io s create-a-canvas-tightly-holding-a-word-st2h1 file  index html This image is a screenshot of a CSS Grid layout of four full-bleed canvases

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Pure-CSS solution with calc    CSS units and math  This is precisely not what OP asks  but may make someone s day  This answer is not spoon-feedingly easy and needs some researching on the developer end   I came finally to get a pure-CSS solution for this using calc   with different units  You will need some basic mathematical understanding of formulas to work out your expression for calc     When I worked this out  I had to get a full-page-width responsive header with some padding few parents up in DOM  I ll use my values here  replace them with your own   To mathematics  You will need    Nicely adjusted ratio in some viewport  I used 320 pixels  thus I got 24 pixels high and 224 pixels wide  so the ratio is 9 333    or 28   3 The container width  I had padding  3em and full width so this got to 100wv - 2   3em   X is the width of container  so replace it with your own expression or adjust the value to get full-page text  R is the ratio you will have  You can get it by adjusting the values in some viewport  inspecting element width and height and replacing them with your own values  Also  it is width   heigth     x   100vw - 2   3em   100vw - 6em r   224px 24px   9 333      28   3  y   x   r      100vw - 6em     28   3       100vw - 6em    3   28      300vw - 18em    28      75vw - 4 5rem    7   And bang  It worked  I wrote  font-size  calc  75vw - 4 5rem    7    to my header and it adjusted nicely in every viewport   But how does it work   We need some constants up here  100vw means the full width of viewport  and my goal was to establish full-width header with some padding   The ratio  Getting a width and height in one viewport got me a ratio to play with  and with ratio I know what the height should be in other viewport width  Calculating them with hand would take plenty of time and at least take lots of bandwidth  so it s not a good answer   Conclusion  I wonder why no-one has figured this out and some people are even telling that this would be impossible to tinker with CSS  I don t like to use JavaScript in adjusting elements  so I don t accept JavaScript  and forget about jQuery  answers without digging more  All in all  it s good that this got figured out and this is one step to pure-CSS implementations in website design   I apologize of any unusual convention in my text  I m not native speaker in English and am also quite new to writing Stack nbsp Overflow answers   It should also be noted that we have evil scrollbars in some browsers  For example  when using Firefox I noticed that 100vw means the full width of viewport  extending under scrollbar  where content cannot expand    so the fullwidth text has to be margined carefully and preferably get tested with many browsers and devices

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Artistically  if you need to fit two or more lines of text within the same width regardless of their character count then you have nice options   It s best to find a dynamical solution so whatever text is entered we end up with a nice display   Let s see how we may approach    x000D   x000D  var els       document querySelectorAll   divtext    x000D  refWidth      els 0  clientWidth  x000D  refFontSize   parseFloat window getComputedStyle els 0  null  x000D                                  getPropertyValue  font-size     x000D   x000D  els forEach  el i    gt  el style fontSize   refFontSize   refWidth   els i  clientWidth    px   x000D   container   x000D    display  inline-block  x000D    background-color  black  x000D    padding  0 6vw 1 2vw  x000D    x000D   divtext   x000D    display  table  x000D    color  white  x000D    font-family  impact  x000D    font-size  4 5vw  x000D    x000D   lt div id  container  gt  x000D     lt div class  divtext  gt THIS IS JUST AN lt  div gt  x000D     lt div class  divtext  gt EXAMPLE lt  div gt  x000D     lt div class  divtext  gt TO SHOW YOU WHAT lt  div gt  x000D     lt div class  divtext  gt YOU WANT lt  div gt  x000D   lt  div gt  x000D   x000D   x000D    All we do is to get the width  els 0  clientWidth  and the font size  parseFloat window getComputedStyle els 0  null  getPropertyValue  font-size     of the first line as a reference and then just calculate the subsequent lines font size accordingly

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This worked for me   I try to approximate font-size based on a width height got from setting  font-size  10px   Basically  the idea is  if I have 20 nbsp pixels width and 11 nbsp pixels height with  font-size  10px   so what would it be the maximum font-size to math a container of 50 nbsp pixels width and 30 nbsp pixels height    The answer is a double proportion system     20 10 50 X  11 10 30 Y       X   10 50  20  Y   10 30  11    Now X is a font-size that will match width  and Y is a font-size that will match height  take the smallest value  function getMaxFontSizeApprox el       var fontSize   10      var p   el parentNode       var parent h   p offsetHeight   p offsetHeight   p style pixelHeight      if  parent h          parent h   0       var parent w   p offsetHeight   p offsetWidth   p style pixelWidth      if  parent w          parent w   0       el style fontSize   fontSize    px        var el h   el offsetHeight   el offsetHeight   el style pixelHeight      if  el h          el h   0       var el w   el offsetHeight   el offsetWidth   el style pixelWidth      if  el w          el w   0          0 5 is the error on the measure that JavaScript does        if the real measure had been 12 49 px   gt  JavaScript would have said 12px        so we think about the worst case when could have  we add 0 5 to         compensate the round error     var fs1    fontSize  parent w   0 5    el w   0 5       var fs2    fontSize  parent h    0 5   el h   0 5        fontSize   Math floor Math min fs1 fs2        el style fontSize   fontSize    px       return fontSize      NB  the argument of the function must be a span element or an element which is smaller than its parent  otherwise if children and parent have both the same width height function will fail

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Use CSS Variables  No one has mentioned CSS variables yet  and this approach worked best for me  so   Let s say you ve got a column on your page that is 100  of the width of a mobile user s screen  but has a max-width of 800px  so on desktop there s some space on either side of the column  Put this at the top of your page    lt script gt  document documentElement style setProperty  --column-width   Math min window innerWidth  800   px     lt  script gt    And now you can use that variable  instead of the built-in vw unit  to set the size of your font  E g   p     font-size  calc  var --column-width    100        It s not a pure CSS approach  but it s pretty close

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There is a way to do this without JavaScript   You can use an inline SVG image  You can use CSS on an SVG if it is inline  You have to remember that using this method means your SVG image will respond to its container size   Try using the following solution     HTML   lt div gt     lt svg xmlns  http   www w3 org 2000 svg  viewBox  0 0 360 96 358 98   gt         lt text gt SAVE  500 lt  text gt     lt  svg gt   lt  div gt    CSS  div     width  50      Set your container width      height  50      Set your container height        svg     width  100     height  auto      text     transform  translate 40px  202px     font-size  62px    fill   000      Example  https   jsfiddle net k8L4xLLa 32   Want something more flashy   SVG images also allow you to do cool stuff with shapes and junk  Check out this great use case for scalable text     https   jsfiddle net k8L4xLLa 14

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My own solution  jQuery-based  works by gradually increasing the font size until the container gets a big increase in height  meaning it got a line break    It s pretty simple  but works fairly well  and it is very easy to use  You don t have to know anything about the font being used  everything is taken care of by the browser   You can play with it on http   jsfiddle net tubededentifrice u5y15d0L 2   The magic happens here   var setMaxTextSize function jElement           Get and set the font size into data for reuse upon resize     var fontSize parseInt jElement data quickFitFontSizeData      parseInt jElement css  font-size         jElement data quickFitFontSizeData  fontSize           Gradually increase font size until the element gets a big increase in height  i e  line break      var i   0      var previousHeight      do               previousHeight jElement height            jElement css  font-size           fontSize     px              while i    lt  300  amp  amp  jElement height  -previousHeight  lt  fontSize 2          Finally  go back before the increase in height and set the element as resized by adding quickFitSetClass     fontSize -  1      jElement addClass quickFitSetClass  css  font-size        fontSize    px         return fontSize

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Take look at my code  It makes the font size smaller to fit whatever there   But I think this doesn t lead to a good user experience  var containerWidth       ui-id-2   width    var items       quickSearchAutocomplete  ui-menu-item    var fontSize   16   items each function           Displaying a value depends sometimes on your case  You may make it block or inline-table instead of inline-block or whatever value that make the div take overflow width        this  css   whiteSpace    nowrap    display    inline-block         while    this  width    gt  containerWidth            console log    this  width        this  width      containerWidth    containerWidth             this  css  font-size   fontSize -  0 5

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There is a big philosophy for this issue    The easiest thing to do would be to give a certain font-size to body  I recommend 10   and then all the other element would have their font in em or rem  I ll give you an example to understand those units  Em is always relative to its parent   body font-size  10px    menu font-size  2em      That means 2 10 pixels    20 pixels     menu li font-size  1 5em      That means 1 5 20 pixels   30 pixels      Rem is always relative to body   body font-size  10px    menu font-size  2rem      That means 2 10 pixels   20 pixels     menu li font-size  1 5rem      that means 1 5 10 pixels   15 pixels      And then you could create a script that would modify font-size relative to your container width  But this isn t what I would recommend  Because in a 900 pixels width container for example you would have a p element with a 12 pixels font-size let s say  And on your idea that would become an 300 pixels wide container at 4 pixels font-size  There has to be a lower limit   Other solutions would be with media queries  so that you could set font for different widths   But the solutions that I would recommend is to use a JavaScript library that helps you with that  And fittext js that I found so far

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I ve prepared a simple scale function using CSS transform instead of font-size  You can use it inside of any container  you don t have to set media queries  etc      Blog post  Full width CSS  amp  JS scalable header  The code   function scaleHeader       var scalable   document querySelectorAll   scale--js      var margin   10    for  var i   0  i  lt  scalable length  i          var scalableContainer   scalable i  parentNode      scalable i  style transform    scale 1        var scalableContainerWidth   scalableContainer offsetWidth - margin      var scalableWidth   scalable i  offsetWidth      scalable i  style transform    scale     scalableContainerWidth   scalableWidth            scalableContainer style height   scalable i  getBoundingClientRect   height    px           Working demo  https   codepen io maciejkorsan pen BWLryj

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This web component changes the font size so the inner text width matches the container width  Check the demo   You can use it like this      lt full-width-text gt Lorem Ipsum lt  full-width-text gt

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100  is relative to the base font size  which  if you haven t set it  would be the browser s user-agent default    To get the effect you re after  I would use a piece of JavaScript code to adjust the base font size relative to the window dimensions

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Try to use the fitText plugin  because Viewport sizes isn t the solution of this problem   Just add the library    lt script src  http   ajax googleapis com ajax libs jquery 1 jquery min js  gt  lt  script gt      And change font-size for correct by settings the coefficient of text       text div   fitText 0 8     You can set maximum and minimum values of text       text div   fitText 0 8    minFontSize   12px   maxFontSize   36px

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In case it s helpful to anyone  most of the solutions in this thread were wrapping text into multiple lines  form e   But then I found this  and it worked   https   github com chunksnbits jquery-quickfit  Example usage       someText   quickfit  max 50 tolerance  4

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Straight up media queries seems like a much simpler and more understandable solution to resizing font based on container sizes that may be dynamic   The below resizes the font to the size of the container  whether the container is scaled to the size of the viewport  or if it s reached its max value  If you have non-100  wide containers  you could adjust the vw accordingly    container       width  100       max-width  600px     headline       font-size  20vw     subhead       font-size  5vw     media  min-width 600px         headline           font-size  120px             subhead           font-size  32px

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My problem was similar  but related to scaling text within a heading  I tried Fit Font  but I needed to toggle the compressor to get any results  since it was solving a slightly different problem  as was Text Flow   So I wrote my own little plugin that reduced the font size to fit the container  assuming you have overflow  hidden and white-space  nowrap so that even if reducing the font to the minimum doesn t allow showing the full heading  it just cuts off what it can show    function            Reduces the size of text in the element to fit the parent      fn reduceTextSize   function options        options     extend         minFontSize  10        options        function checkWidth em          var  em     em         var oldPosition    em css  position           em css  position    absolute          var width    em width           em css  position   oldPosition         return width             return this each function          var  this     this         var  parent    this parent          var prevFontSize        while  checkWidth  this   gt   parent width              var currentFontSize   parseInt  this css  font-size   replace  px                    Stop looping if min font size reached  or font size did not change last iteration          if  isNaN currentFontSize     currentFontSize  lt   options minFontSize                prevFontSize  amp  amp  prevFontSize    currentFontSize              break                    prevFontSize   currentFontSize           this css  font-size    currentFontSize - 1     px                            jQuery

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EDIT  If the container is not the body CSS Tricks covers all of your options in Fitting Text to a Container   If the container is the body  what you are looking for is Viewport-percentage lengths      The viewport-percentage lengths are relative to the size of the initial containing block  When the height or width of the initial containing block is changed  they are scaled accordingly  However  when the value of overflow on the root element is auto  any scroll bars are assumed not to exist    The values are    vw    of the viewport width  vh    of the viewport height  vi  1  of the viewport size in the direction of the root element s inline axis  vb  1  of the viewport size in the direction of the root element s block axis  vmin  the smaller of vw or vh  vmax  the larger or vw or vh    1 v  is equal to 1  of the initial containing block   Using it looks like this   p       font-size  4vw      As you can see  when the viewport width increases  so do the font-size  without needing to use media queries   These values are a sizing unit  just like px or em  so they can be used to size other elements as well  such as width  margin  or padding   Browser support is pretty good  but you ll likely need a fallback  such as   p       font-size  16px      font-size  4vw      Check out the support statistics  http   caniuse com  feat viewport-units   Also  check out CSS-Tricks for a broader look  Viewport Sized Typography  Here s a nice article about setting minimum maximum sizes and exercising a bit more control over the sizes  Precise control over responsive typography  And here s an article about setting your size using calc   so that the text fills the viewport  http   codepen io CrocoDillon pen fBJxu  Also  please view this article  which uses a technique dubbed  molten leading  to adjust the line-height as well  Molten Leading in CSS

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But what if the container is not the viewport  body    The real answer is in the transform property allows you to visually manipulate an element by skewing  rotating  translating  or scaling   https   css-tricks com almanac properties t transform

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But what if the container is not the viewport  body   This question is asked in a comment by Alex under the accepted answer  That fact does not mean vw cannot be used to some extent to size for that container  Now to see any variation at all one has to be assuming that the container in some way is flexible in size  Whether through a direct percentage width or through being 100  minus margins  The point becomes  quot moot quot  if the container is always set to  let s say  200px wide--then just set a font-size that works for that width  Example 1 With a flexible width container  however  it must be realized that in some way the container is still being sized off the viewport  As such  it is a matter of adjusting a vw setting based off that percentage size difference to the viewport  which means taking into account the sizing of parent wrappers  Take this example  div       width  50       border  1px solid black      margin  20px      font-size  16px         100   viewport width  as 1vw   1 100th of that        So if the container is 50  of viewport  as here         then factor that into how you want it to size         Let s say you like 5vw if it were the whole width         then for this container  size it at 2 5vw  5    5  i e  50               font-size  2 5vw     Assuming here the div is a child of the body  it is 50  of that 100  width  which is the viewport size in this basic case  Basically  you want to set a vw that is going to look good to you  As you can see in my comment in the above CSS content  you can  quot think quot  through that mathematically with respect to the full viewport size  but you don t need to do that  The text is going to  quot flex quot  with the container because the container is flexing with the viewport resizing  UPDATE  here s an example of two differently sized containers  Example 2 You can help ensure viewport sizing by forcing the calculation based off that  Consider this example  html  width  100       Force  html  to be viewport width    body  width  150        Overflow the body     div       width  50       border  1px solid black      margin  20px      font-size  16px         100   viewport width  as 1vw   1 100th of that        Here  the body is 150  of viewport  but the container is 50         of viewport  so both parents factor  into how you want it to size         Let s say you like 5vw if it were the whole width         then for this container  size it at 3 75vw         5   1 5  i e  150       5  i e  50              font-size  3 75vw     The sizing is still based off viewport  but is in essence set up based off the container size itself  Should Size of the Container Change Dynamically    If the sizing of the container element ended up changing dynamically its percentage relationship either via  media breakpoints or via JavaScript  then whatever the base  quot target quot  was would need recalculation to maintain the same  quot relationship quot  for text sizing  Take example  1 above  If the div was switched to 25  width by either  media or JavaScript  then at the same time  the font-size would need to adjust in either the media query or by JavaScript to the new calculation of 5vw    25   1 25  This would put the text size at the same size it would have been had the  quot width quot  of the original 50  container been reduced by half from viewport sizing  but has now been reduced due to a change in its own percentage calculation  A Challenge With the CSS3 calc   function in use  it would become difficult to adjust dynamically  as that function does not work for font-size purposes at this time  So you could not do a pure CSS  3 adjustment if your width is changing on calc    Of course  a minor adjustment of width for margins may not be enough to warrant any change in font-size  so it may not matter

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This may not be super practical  but if you want a font to be a direct function of the parent  without having any JavaScript that listens loops  interval  to read the size of the div page  there is a way to do it  Iframes   Anything within the iframe will consider the size of the iframe as the size of the viewport  So the trick is to just make an iframe whose width is the maximum width you want your text to be  and whose height is equal to the maximum height   the particular text s aspect ratio   Setting aside the limitation that viewport units can t also come along side parent units for text  as in  having the   size behave like everyone else   viewport units do provide a very powerful tool  being able to get the minimum maximum dimension  You can t do that anywhere else - you can t say   make the height of this div be the width of the parent   something   That being said  the trick is to use vmin  and to set the iframe size so that  fraction    total height is a good font size when the height is the limiting dimension  and  fraction    total width when the width is the limiting dimension  This is why the height has to be a product of the width and the aspect ratio   For my particular example  you have   main iframe    position  absolute    top  50     left  50     width  100     height  calc 3 5   100      background  rgba 0  0  0  0     border-style  none    transform  translate3d -50   -50   0       The small annoyance with this method is that you have to manually set the CSS of the iframe  If you attach the whole CSS file  that would take up a lot of bandwidth for many text areas  So  what I do is attach the rule that I want directly from my CSS   var rule   document styleSheets 1  rules 4   var iDoc   document querySelector  iframe   contentDocument  iDoc styleSheets 0  insertRule rule cssText     You can write small function that gets the CSS rule   all CSS rules that would affect the text area   I cannot think of another way to do it without having some cycling listening JavaScript  The real solution would be for browsers to provide a way to scale text as a function of the parent container and to also provide the same vmin vmax type functionality   JSFiddle  https   jsfiddle net 0jr7rrgm 3   click once to lock the red square to the mouse  and click again to release   Most of the JavaScript in the fiddle is just my custom click-drag function

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In order to make font-size fit its container  rather than the window  see the resizeFont   function I have shared in this question  a combination of other answers  most of which are already linked here   It is triggered using window addEventListener  resize   resizeFont     Vanilla JavaScript  Resize font-awesome to fit container  JavaScript   function resizeFont       var elements    document getElementsByClassName  resize      console log elements     if  elements length  lt  0        return         len   elements length    for   i   0   i  lt   len   i          var el   elements  i       el style fontSize    100        for  var size   100  el scrollHeight  gt  el clientHeight  size -  10          el style fontSize   size                      You could perhaps use vw vh as a fallback  so you dynamically assign em or rem units using JavaScript  ensuring that the fonts do scale to the window if JavaScript is disabled   Apply the  resize class to all elements containing text you wish to be scaled   Trigger the function prior to adding the window resize event listener  Then  any text which doesn t fit its container will be scaled down when the page loads  as well as when it is resized   NOTE  The default font-size must be set to either em rem or   to achieve proper results

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Inside your CSS  try adding this at the bottom changing the 320 pixels width for wherever your design starts breaking        media only screen and  max-width  320px             body   font-size  1em             Then give the font-size in  px  or  em  as you wish

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You may be you looking for something like this    http   jsfiddle net sijav dGsC9 4   http   fiddle jshell net sijav dGsC9 4 show   I have used flowtype  and it s working great  however it s JavaScript and not a pure CSS solution       body   flowtype       minFont  10      maxFont  40      minimum  500      maximum  1200      fontRatio  70

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Using vw  em  amp  co  works for sure  but IMO it always needs a human s touch for fine-tuning   Here s a script I just wrote based on  tnt-rox  answer that tries to automatize that human s touch    x000D   x000D      controller   click function    x000D         h2   each function    x000D          var x000D               el     this   x000D              max    el get 0   x000D              el   null x000D            x000D          max   x000D              max x000D                max offsetWidth x000D                320 x000D            x000D           el css   x000D               font-size    1em   x000D               display    inline   x000D              x000D          el    el get 0   x000D   x000D          el get float   function    x000D              var x000D                  fs   0 x000D                x000D              if  this style  amp  amp  this style fontSize    x000D                  fs   parseFloat this style fontSize replace     d     em g    1     x000D                x000D              return fs  x000D             x000D   x000D          el bigger   function    x000D              this style fontSize    this get float     0 1     em   x000D             x000D   x000D          while  el offsetWidth  lt  max    x000D              el bigger    x000D            x000D   x000D             Finishing touch  x000D           el css   x000D               font-size     el get float   -0 1    em    x000D               line-height    normal   x000D               display       x000D              x000D              end of  each  x000D            end of  font scaling test  x000D  div   x000D    width  50   x000D    background-color  tomato  x000D    font-family   Arial   x000D    x000D   x000D  h2   x000D    white-space  nowrap  x000D    x000D   x000D  h2 nth-child 2    x000D    font-style  italic  x000D    x000D   lt script src  https   ajax googleapis com ajax libs jquery 1 9 1 jquery min js  gt  lt  script gt  x000D   lt input type  button  id  controller  value  Apply    gt  x000D   lt div gt  x000D     lt h2 gt Lorem ipsum dolor lt  h2 gt  x000D     lt h2 gt Test String lt  h2 gt  x000D     lt h2 gt Sweet Concatenation lt  h2 gt  x000D     lt h2 gt Font Scaling lt  h2 gt  x000D   lt  div gt  x000D   x000D   x000D    It basically reduces the font-size to 1em and then starts incrementing by 0 1 until it reaches maximum width   JSFiddle

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HTML  lt div style  quot height 100px  width 200px  quot  gt     lt div id  qwe  gt      test    lt  div gt   lt  div gt   JavaScript code for maximizing font-size  var fontSize  maxHeight  maxWidth  textElement  parentElement  textElement   document getElementById  qwe    parentElement   textElement parentElement      maxHeight   parentElement clientHeight  maxWidth   parentElement clientWidth  fontSize   maxHeight  var minFS   3  maxFS   fontSize  while  fontSize    minFS      textElement style fontSize      fontSize px     if  textElement offsetHeight  lt  maxHeight  amp  amp  textElement offsetWidth  lt   maxWidth        minFS   fontSize      else      maxFS   fontSize        fontSize   Math floor  minFS   maxFS  2     textElement style fontSize      minFS px

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Always have your element with this attribute   JavaScript  element style fontSize    100     or  CSS  style    font-size  100     When you go fullscreen  you should already have a scale variable calculated  scale   1 or scale   1   Then  on fullscreen   document body style fontSize    scale   100           It works nicely with little code

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I don t see any answer with reference to CSS flex property  but it can be very useful too

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Solution with SVG    x000D   x000D   resizeme   x000D    resize  both  x000D    margin  0  x000D    padding  0  x000D    height  75px  x000D    width  500px  x000D    background-color  lightblue  x000D    overflow  hidden  x000D    x000D   lt div class  resizeme  gt  x000D     lt svg x000D      width  100   x000D      height  100   x000D      viewBox  0 0 500 75  x000D      preserveAspectRatio  xMinYMid meet  x000D      style  background-color green  x000D      xmlns  http   www w3 org 2000 svg  x000D      xmlns xlink  http   www w3 org 1999 xlink  x000D     gt  x000D           lt text x000D            x  0  x000D            y  75  x000D            font-size  75  x000D            fill  black  x000D           gt   Resize This   lt  text gt  x000D         lt  svg gt  x000D   lt  div gt  x000D   x000D   x000D    Solution with SVG and text-wrapping using foreignObject    x000D   x000D   resizeme   x000D    resize  both  x000D    margin  0  x000D    padding  0  x000D    height  200px  x000D    width  500px  x000D    background-color  lightblue  x000D    overflow  hidden  x000D    x000D   lt div class  resizeme  gt  x000D     lt svg x000D      width  100   x000D      height  100   x000D      viewBox  0 0 500 200  x000D      preserveAspectRatio  xMinYMin meet  x000D     gt  x000D         lt foreignObject width  100   height  100   xmlns  http   www w3 org 1999 xhtml  gt  x000D           lt div xmlns  http   www w3 org 1999 xhtml  style  background-color lightgreen   gt  x000D             lt h1 gt heading lt  h1 gt  x000D             lt p gt Resize the blue box  lt  p gt  x000D           lt  div gt  x000D         lt  foreignObject gt  x000D       lt  svg gt  x000D   lt  div gt  x000D   x000D   x000D

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Try http   simplefocus com flowtype   This is what I use for my sites  and it has worked perfectly

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In one of my projects I use a  mixture  between vw and vh to adjust the font size to my needs  for example   font-size  calc 3vw   3vh     I know this doesn t answer the OP s question  but maybe it can be a solution to anyone else

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Here is the function   document body setScaledFont   function f      var s   this offsetWidth  fs   s   f    this style fontSize   fs          return this      Then convert all your documents child element font sizes to em s or     Then add something like this to your code to set the base font size   document body setScaledFont 0 35   window onresize   function         document body setScaledFont 0 35       http   jsfiddle net 0tpvccjt

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For dynamic text  this plugin is quite useful   http   freqdec github io slabText   Simply add CSS    slabtexted  slabtext       display  -moz-inline-box      display  inline-block      white-space  nowrap     slabtextinactive  slabtext       display  inline      white-space  normal      font-size  1em  important      letter-spacing  inherit  important      word-spacing  inherit  important       letter-spacing  normal  important       word-spacing  normal  important     slabtextdone  slabtext       display  block      And the script       mydiv   slabText

[css] Font scaling based on width of container

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