Preloading @font-face fonts?

问题:

Is it possible to preload or otherwise cache @font-face fonts, most likely with javascript, before the page loads so you don't get that ugly jump when the page finally does load?

回答1:

I'm not aware of any current technique to avoid the flicker as the font loads, however you can minimize it by sending proper cache headers for your font and making sure that that request goes through as quickly as possible.

回答2:

A simple technique is to put this somewhere in your index:

<div class="font_preload" style="opacity: 0">
    <span style="font-family: 'myfontface#1font-family', Arial, sans-serif;"></span>
    <span style="font-family: 'myfontface#2font-family', Arial, sans-serif;"></span>
    ...
</div>

Tested on Chrome 34, Safari 7 and FF 29 and IE 11

回答3:

There are a few techniques for "preloading" here: http://paulirish.com/2009/fighting-the-font-face-fout/

Mostly tricking the browser into downloading the file as fast as possible..

You can also deliver it as a data-uri, which helps a lot. and also you could hide the page content and show it when its ready.

回答4:

2017: You now have preload

MDN: The preload value of the element's rel attribute allows you to write declarative fetch requests in your HTML , specifying resources that your pages will need very soon after loading, which you therefore want to start preloading early in the lifecycle of a page load, before the browser's main rendering machinery kicks in. This ensures that they are made available earlier and are less likely to block the page's first render, leading to performance improvements.

<link rel="preload" href="/fonts/myfont.eot" as="font" crossorigin="anonymous" />

Check browser compatibility.

It is most useful for font preloading (not waiting for the browser to find it in some CSS). You can also preload some logos, icons and scripts.

Other techniques pro/cons are discussed here (not my blog).

回答5:

Proper font pre-loading is a big hole in the HTML5 spec. I've gone through all of this stuff and the most reliable solution I've found is to use Font.js:

http://pomax.nihongoresources.com/pages/Font.js/

You can use it to load fonts using the same API you use to load images

var anyFont = new Font();
anyFont.src = "fonts/fileName.otf";
anyFont.onload = function () {
  console.log("font loaded");
}

It's much simpler and more lightweight than Google's hulking Webfont Loader

Here's the github repo for Font.js:

https://github.com/Pomax/Font.js

回答6:

This should solve your problem.

To answer your initial question: yes you can. Only Gecko and WebKit browsers support it currently though.
You just need to add link tags in your head:

<link rel="prefetch" href="pathto/font">
<link rel="prerender" href="pathto/page">

回答7:

i did this by adding some letter in my main document and made it transparent and assigned the font that I wanted to load.

e.g.

<p>normal text from within page here and then followed by:
<span style="font-family:'Arial Rounded Bold'; color:transparent;">t</span>
</p>

回答8:

Via Google's webfontloader

var fontDownloadCount = 0;
WebFont.load({
    custom: {
        families: ['fontfamily1', 'fontfamily2']
    },
    fontinactive: function() {
        fontDownloadCount++;
        if (fontDownloadCount == 2) {
            // all fonts have been loaded and now you can do what you want
        }
    }
});

回答9:

Recently I was working on a game compatible with CocoonJS with DOM limited to the canvas element - here is my approach:

Using fillText with a font that has not been loaded yet will execute properly but with no visual feedback - so the canvas plane will stay intact - all you have to do is periodically check the canvas for any changes (for example looping through getImageData searching for any non transparent pixel) that will happen when the font loads properly.

I have explained this technique a little bit more in my recent article http://rezoner.net/preloading-font-face-using-canvas,686

回答10:

Google has a nice library for this: https://developers.google.com/webfonts/docs/webfont_loader You can use almost any fonts and the lib will add classes to the html tag.

It even gives you javascript events on when certrain fonts are loaded and active!

Don't forget to serve your fontfiles gzipped! it will certainly speed things up!

回答11:

Use the standard CSS Font Loading API.

Wait for (all) the fonts to load, and then show your content:

document.fonts.ready.then((fontFaceSet) => {
    console.log(fontFaceSet.size, 'FontFaces loaded.');
    document.getElementById('waitScreen').style.display = 'none';
});

Demo CodePen.