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mathias's profile
Mathias Bynens
Mathias Bynens
Mathias Bynens
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@mathias

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Mathias BynensVerified account

@mathias

I work on @ChromeDevTools & @v8js at Google and on ECMAScript through TC39. ♥ JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.

Munich, Germany
mths.be
Joined January 2007

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    Mathias Bynens‏Verified account @mathias May 5
    • Report Tweet
    • Report NetzDG Violation

    One of my favorite things about browsers is the fact that you can get away with not closing <style> tags. It’s invalid HTML, but the styles do get applied. 🤯 Useful for minimal test cases: data:text/html,<style>html{background:hotpink}pic.twitter.com/byG9yfxP4o

    Browsing to `data:text/html,<style>html{background:hotpink}` results in a nicely colored canvas.
    7:45 AM - 5 May 2020
    • 25 Retweets
    • 150 Likes
    • Eroan Boyer Friedhold Matz Alexis Olv | Mkt & Dev /dev/shahriar Dee_Man Awais Carsten Bönsel Paan hantu yang diikat
    11 replies 25 retweets 150 likes
      1. New conversation
      2. Fregante‏ @fregante May 5
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        • Report NetzDG Violation
        Replying to @mathias

        That's my favorite part when writing tables in GitHub comments: <table> <th>1 <th>2 <tr> <td>a <td>b </table> <-- skip this if the table is at the end of the comment

        1 reply 0 retweets 0 likes
      3. Mathias Bynens‏Verified account @mathias May 5
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        • Report NetzDG Violation
        Replying to @fregante

        Everything you do here except for omitting </table> is actually valid. Same for </p> and </li> and so on. 👍

        0 replies 0 retweets 1 like
      4. End of conversation
      1. New conversation
      2. Awais‏Verified account @MrAhmadAwais May 5
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        Replying to @mathias

        What's the usecase for this

        1 reply 0 retweets 0 likes
      3. Mathias Bynens‏Verified account @mathias May 5
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        Replying to @MrAhmadAwais

        I use it all the time when creating minimal test cases for @ChromeDevTools behavior. Admittedly, perhaps not a very common use case :) It’s mostly an interesting curiosity.

        0 replies 0 retweets 1 like
      4. End of conversation
      1. New conversation
      2. Paul Melero‏ @paul_melero May 5
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        Replying to @mathias

        It also reminds me of this: data:text/html,<body bgcolor="mathias">

        1 reply 0 retweets 0 likes
      3. Mathias Bynens‏Verified account @mathias May 5
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        Replying to @paul_melero

        https://mothereff.in/bgcolor#paul 

        1 reply 0 retweets 2 likes
      4. 1 more reply
      1. New conversation
      2. Connor Clark‏ @cjamcl May 5
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        Replying to @mathias

        I actually think this is valid HTML! (spec: https://html.spec.whatwg.org/#parsing ) First, it is normalized to `<html><head><style>...</head>` (see 12.2.4.1 on insertion modes. This is my favorite part of the spec (that I've read so far ...)

        1 reply 0 retweets 0 likes
      3. Connor Clark‏ @cjamcl May 5
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        Replying to @cjamcl @mathias

        Second, I don't think failing to close a tag is considered a parse error. I couldn't find exactly how the spec says it should be handled, but note that it isn't listed as an error in this table: https://html.spec.whatwg.org/#parse-errors 

        2 replies 0 retweets 0 likes
      4. 1 more reply
      1. Fake “Unicode.”  ↙️‏ @FakeUnicode May 5
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        Replying to @mathias

        data:text/html,.<style style="display:block;background:white;" contenteditable>html{background:hotpink} make it editablepic.twitter.com/rsyRKJ2iRP

        0 replies 3 retweets 23 likes
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      1. New conversation
      2. Simon Sapin‏ @SimonSapin May 5
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        Replying to @mathias

        You don’t have to close anything in CSS either! data:text/html,<style>html:before{content:"test

        1 reply 1 retweet 18 likes
      3. (((Niels Müller)))‏ @phidip May 5
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        Replying to @SimonSapin @mathias

        I hope you will forgive me, but I don’t tell my students. Things like that make long back to xhtml :)

        1 reply 0 retweets 0 likes
      4. 1 more reply

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