CSSOM. Give me all the parsers 😆
November 8, 2026 at 12:58 PM
CSSOM. Give me all the parsers 😆
Nobody cares about the CSSOM so i'm out here hand-parsing things like a peasant.
October 30, 2026 at 10:43 AM
Nobody cares about the CSSOM so i'm out here hand-parsing things like a peasant.
An issue I see is that I'd suggest a huge number of developers would have no idea what a 'CSSOM' is. At least, not by name.
October 30, 2026 at 2:06 PM
An issue I see is that I'd suggest a huge number of developers would have no idea what a 'CSSOM' is. At least, not by name.
CSSOM was such a tease!
The browser now has a built in method for parsing CSS!!
Unless the css uses a custom property, then no.
The browser now has a built in method for parsing CSS!!
Unless the css uses a custom property, then no.
October 30, 2026 at 9:01 PM
CSSOM was such a tease!
The browser now has a built in method for parsing CSS!!
Unless the css uses a custom property, then no.
The browser now has a built in method for parsing CSS!!
Unless the css uses a custom property, then no.
Seriously though, any idea of the positive impact a better CSSOM would have? Trying to get a sense of the scale.
October 30, 2026 at 2:00 PM
Seriously though, any idea of the positive impact a better CSSOM would have? Trying to get a sense of the scale.
it also doesn't map back to a css file, or let you meaningfully map authored styles to computed styles.
and that's before subtle bugs like the CSSOM in Chrome at one point returning background-clip in the background shorthand but crashing when you wrote it back.
and that's before subtle bugs like the CSSOM in Chrome at one point returning background-clip in the background shorthand but crashing when you wrote it back.
October 30, 2026 at 2:37 PM
it also doesn't map back to a css file, or let you meaningfully map authored styles to computed styles.
and that's before subtle bugs like the CSSOM in Chrome at one point returning background-clip in the background shorthand but crashing when you wrote it back.
and that's before subtle bugs like the CSSOM in Chrome at one point returning background-clip in the background shorthand but crashing when you wrote it back.
FidEx focuses on identifying problems caused by the rewriting that is done by the replay system. FidEx compares the layout trees (HTML DOM and CSSOM) and the JavaScript writes for the live and archived web page to detect replay problems and can then create a pinpoint output file.
October 27, 2026 at 6:00 PM
FidEx focuses on identifying problems caused by the rewriting that is done by the replay system. FidEx compares the layout trees (HTML DOM and CSSOM) and the JavaScript writes for the live and archived web page to detect replay problems and can then create a pinpoint output file.
How does a browser load a website? 🌐 Explore DNS, HTTP requests, server responses, HTML parsing, CSS, JavaScript, and browser rendering.
Code. Build. Innovate.
#CodesByAbhay #AbhaySingh #WebDevelopment #Browser #Coding
Code. Build. Innovate.
#CodesByAbhay #AbhaySingh #WebDevelopment #Browser #Coding
October 28, 2026 at 12:00 PM
How does a browser load a website? 🌐 Explore DNS, HTTP requests, server responses, HTML parsing, CSS, JavaScript, and browser rendering.
Code. Build. Innovate.
#CodesByAbhay #AbhaySingh #WebDevelopment #Browser #Coding
Code. Build. Innovate.
#CodesByAbhay #AbhaySingh #WebDevelopment #Browser #Coding
A table worked after a click and collapsed into one column after a refresh.
Strict CSP blocks the style attribute React renders on the server, and hydration never puts it back. A click goes through the CSSOM, which CSP doesn't check.
blog.piotrnalepa.pl/2026/10/13/w...
Strict CSP blocks the style attribute React renders on the server, and hydration never puts it back. A click goes through the CSSOM, which CSP doesn't check.
blog.piotrnalepa.pl/2026/10/13/w...
Why do my tables collapse into one column? Strict CSP vs inline styles in React
A strict CSP blocks style attributes in server-rendered HTML, so a React table collapses after a page refresh. Here's why it happens and 4 ways to fix it.
blog.piotrnalepa.pl
October 20, 2026 at 6:57 PM
A table worked after a click and collapsed into one column after a refresh.
Strict CSP blocks the style attribute React renders on the server, and hydration never puts it back. A click goes through the CSSOM, which CSP doesn't check.
blog.piotrnalepa.pl/2026/10/13/w...
Strict CSP blocks the style attribute React renders on the server, and hydration never puts it back. A click goes through the CSSOM, which CSP doesn't check.
blog.piotrnalepa.pl/2026/10/13/w...
Wow, what a somewhat unexpected side effect of `@property`! I think you identify a good issue because sometimes I’ll need to add a CSSOM type a local component variable to achieve an animation or effect, which ideally wouldn’t have a global impact. And out-of-order complicates thats a bit.
October 11, 2026 at 6:48 PM
Wow, what a somewhat unexpected side effect of `@property`! I think you identify a good issue because sometimes I’ll need to add a CSSOM type a local component variable to achieve an animation or effect, which ideally wouldn’t have a global impact. And out-of-order complicates thats a bit.
CVE-2026-93752 CSSOM DoS: setProperty() fails to validate reserved names, so a stylesheet declaring "length" wrecks the internal counter and blows up memory during cssText serialization. CVSS 7.5, no patch yet. Audit your CSS tooling now. https://www.valtersit.com/cve/CVE-2026-93752/ #CVE #infosec
CVE-2026-93752 Denial of Service in CSSOM
www.valtersit.com
September 25, 2026 at 5:30 AM
CVE-2026-93752 CSSOM DoS: setProperty() fails to validate reserved names, so a stylesheet declaring "length" wrecks the internal counter and blows up memory during cssText serialization. CVSS 7.5, no patch yet. Audit your CSS tooling now. https://www.valtersit.com/cve/CVE-2026-93752/ #CVE #infosec
CVE-2026-93752 - CSSOM through 0.5.0 Denial of Service via length Property
CVE ID : CVE-2026-93752
Published : Sept. 18, 2026, 6:18 p.m. | 21 minutes ago
Description : CSSOM through 0.5.0 contains a denial of service vulnerability in CSSStyleDeclaration.setProperty() tha...
CVE ID : CVE-2026-93752
Published : Sept. 18, 2026, 6:18 p.m. | 21 minutes ago
Description : CSSOM through 0.5.0 contains a denial of service vulnerability in CSSStyleDeclaration.setProperty() tha...
CVE-2026-93752 - CSSOM through 0.5.0 Denial of Service via length Property
CSSOM through 0.5.0 contains a denial of service vulnerability in CSSStyleDeclaration.setProperty() that fails to validate reserved property names. Attackers can supply a stylesheet with a declaration named length to replace the internal counter and trigger excessive memory allocation during cssText serialization, causing process termination.
cvefeed.io
September 18, 2026 at 7:09 PM
CVE-2026-93752 - CSSOM through 0.5.0 Denial of Service via length Property
CVE ID : CVE-2026-93752
Published : Sept. 18, 2026, 6:18 p.m. | 21 minutes ago
Description : CSSOM through 0.5.0 contains a denial of service vulnerability in CSSStyleDeclaration.setProperty() tha...
CVE ID : CVE-2026-93752
Published : Sept. 18, 2026, 6:18 p.m. | 21 minutes ago
Description : CSSOM through 0.5.0 contains a denial of service vulnerability in CSSStyleDeclaration.setProperty() tha...
🟠 CVE-2026-93752 - High (7.5)
CSSOM through 0.5.0 contains a denial of service vulnerability in CSSStyleDeclaration.setProperty...
https://www.thehackerwire.com/vulnerability/CVE-2026-93752/
#infosec #cybersecurity #CVE #vulnerability #security #patchstack
CSSOM through 0.5.0 contains a denial of service vulnerability in CSSStyleDeclaration.setProperty...
https://www.thehackerwire.com/vulnerability/CVE-2026-93752/
#infosec #cybersecurity #CVE #vulnerability #security #patchstack
September 18, 2026 at 8:01 PM
🟠 CVE-2026-93752 - High (7.5)
CSSOM through 0.5.0 contains a denial of service vulnerability in CSSStyleDeclaration.setProperty...
https://www.thehackerwire.com/vulnerability/CVE-2026-93752/
#infosec #cybersecurity #CVE #vulnerability #security #patchstack
CSSOM through 0.5.0 contains a denial of service vulnerability in CSSStyleDeclaration.setProperty...
https://www.thehackerwire.com/vulnerability/CVE-2026-93752/
#infosec #cybersecurity #CVE #vulnerability #security #patchstack
5/ CSS custom properties.
Them: "basic support," Sep 15.
Us: var() substitution + CSSOM readback since Sep 4.
Them: "basic support," Sep 15.
Us: var() substitution + CSSOM readback since Sep 4.
September 15, 2026 at 4:16 PM
5/ CSS custom properties.
Them: "basic support," Sep 15.
Us: var() substitution + CSSOM readback since Sep 4.
Them: "basic support," Sep 15.
Us: var() substitution + CSSOM readback since Sep 4.
I'd been looking at CSSOM, which is especially limited about what it can expeess. There IDL is riddled with so many untyped CSSOMString "string goes here" values that woefully under-capture css.
But! 1/2
drafts.csswg.org/cssom/#cssrule
But! 1/2
drafts.csswg.org/cssom/#cssrule
CSS Object Model (CSSOM)
drafts.csswg.org
July 3, 2025 at 4:33 PM
I'd been looking at CSSOM, which is especially limited about what it can expeess. There IDL is riddled with so many untyped CSSOMString "string goes here" values that woefully under-capture css.
But! 1/2
drafts.csswg.org/cssom/#cssrule
But! 1/2
drafts.csswg.org/cssom/#cssrule
Another one of those things that would be great to have in the CSSOM.
July 28, 2026 at 1:32 PM
Another one of those things that would be great to have in the CSSOM.
random() in Blink is still behind the experimental flag so crashes can happen. It's probably caused by accessing the CSSOM, and I'm isolating it now to make a bug report.
June 17, 2026 at 7:41 AM
random() in Blink is still behind the experimental flag so crashes can happen. It's probably caused by accessing the CSSOM, and I'm isolating it now to make a bug report.
now brb while I figure out how this affects my matching logic while I wait for a straightforward option like github.com/w3c/csswg-dr...
[cssom] There should be a way to test CSSStyleRules against Elements · Issue #10470 · w3c/csswg-drafts
To determine whether a given CSSStyleRule applies to a DOM element you can take its selectorText and use the element.matches() DOM API to check whether that selector applies to it. Doing so hasn't ...
github.com
July 4, 2025 at 7:23 AM
now brb while I figure out how this affects my matching logic while I wait for a straightforward option like github.com/w3c/csswg-dr...
Found it though: github.com/w3c/csswg-dr...
[cssom] getComputedStyle and/or computedStyleMap to return authored value · Issue #10002 · w3c/csswg-drafts
Hello, I'm an engineer at Webflow, a tool that helps users build websites without having to know all of the CSS/HTML/JS that goes into it. I'm working on part of the tool that checks for accessibil...
github.com
May 5, 2025 at 8:57 AM
Found it though: github.com/w3c/csswg-dr...
I didn't. My only (stalled) suggestion was a better way to check CSSStyleRules against Elements: github.com/w3c/csswg-dr...
[cssom] There should be a way to test CSSStyleRules against Elements · Issue #10470 · w3c/csswg-drafts
To determine whether a given CSSStyleRule applies to a DOM element you can take its selectorText and use the element.matches() DOM API to check whether that selector applies to it. Doing so hasn't ...
github.com
May 5, 2025 at 8:57 AM
I didn't. My only (stalled) suggestion was a better way to check CSSStyleRules against Elements: github.com/w3c/csswg-dr...
なんで新APIを用意せずに破滅的な変更を入れるかねー。まあ、Chromeが既に火中の栗を拾ってくれてるみたいやけど。 www.w3.org/TR/cssom-vie...
CSSOM View Module
www.w3.org
July 3, 2024 at 9:18 AM
なんで新APIを用意せずに破滅的な変更を入れるかねー。まあ、Chromeが既に火中の栗を拾ってくれてるみたいやけど。 www.w3.org/TR/cssom-vie...
I’ve always seen CSS-in-JS as “CSS in JavaScript as the host language” regardless of CSS or CSSOM Syntax. Which would indeed make tailwinds []-styles in JSX some kind of CSS-in-JS (and without gaining much from the host language)
September 15, 2025 at 9:03 PM
I’ve always seen CSS-in-JS as “CSS in JavaScript as the host language” regardless of CSS or CSSOM Syntax. Which would indeed make tailwinds []-styles in JSX some kind of CSS-in-JS (and without gaining much from the host language)
saw a ‘CSSOM made easy’ post where the author failed to realize none of the examples work because he moved stylesheets from local dev to a (non-CORS) CDN at some point
just a minor detail
just a minor detail
November 11, 2025 at 8:04 AM
saw a ‘CSSOM made easy’ post where the author failed to realize none of the examples work because he moved stylesheets from local dev to a (non-CORS) CDN at some point
just a minor detail
just a minor detail
yeah my main job is working with/around an embeddable forms library, and sitewide CSS *constantly* breaks our forms
‘just tweak specificity!’ sure, but since the web team won’t get to it for 6 months, shadow DOM is the only way out (other than CSSOM - yikes and also CORS)
‘just tweak specificity!’ sure, but since the web team won’t get to it for 6 months, shadow DOM is the only way out (other than CSSOM - yikes and also CORS)
November 11, 2025 at 6:59 AM
yeah my main job is working with/around an embeddable forms library, and sitewide CSS *constantly* breaks our forms
‘just tweak specificity!’ sure, but since the web team won’t get to it for 6 months, shadow DOM is the only way out (other than CSSOM - yikes and also CORS)
‘just tweak specificity!’ sure, but since the web team won’t get to it for 6 months, shadow DOM is the only way out (other than CSSOM - yikes and also CORS)
Yea right now if you have other more lenient directives like `connect-src` you can fetch a style and apply it using CSSOM. That's described in developer.mozilla.org/en-US/docs/W...
CSP: style-src - HTTP | MDN
The HTTP Content-Security-Policy (CSP) style-src directive specifies valid sources for stylesheets.
developer.mozilla.org
April 8, 2025 at 12:23 PM
Yea right now if you have other more lenient directives like `connect-src` you can fetch a style and apply it using CSSOM. That's described in developer.mozilla.org/en-US/docs/W...