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Re: [blink-dev] Intent to Ship: Responsively-sized
</span></a></span> </h1> <p class="darkgray font13"> <span class="sender pipe"><a href="/search?l=blink-dev@chromium.org&q=from:%22Alex+Russell%22" rel="nofollow"><span itemprop="author" itemscope itemtype="http://schema.org/Person"><span itemprop="name">Alex Russell</span></span></a></span> <span class="date"><a href="/search?l=blink-dev@chromium.org&q=date:20260518" rel="nofollow">Mon, 18 May 2026 11:41:05 -0700</a></span> </p> </div> <div itemprop="articleBody" class="msgBody"> <!--X-Body-of-Message--> <pre>In case nobody else says it, this is an *incredible* addition to the platform. Thank you so much for making it happen.</pre><pre> LGTM1, pending resolution to the spec PRs. On Sunday, May 17, 2026 at 6:40:23 PM UTC-7 Mike Taylor wrote: > On 5/14/26 5:43 a.m., Koji Ishii wrote: > > *Contact emails* > chris...@chromium.org, ko...@chromium.org, ikilpatr...@chromium.org > > *Explainer* > > <a rel="nofollow" href="https://github.com/w3c/csswg-drafts/blob/main/css-sizing-4/responsive-iframes-explainer.md">https://github.com/w3c/csswg-drafts/blob/main/css-sizing-4/responsive-iframes-explainer.md</a> > > *Specification* > <a rel="nofollow" href="https://drafts.csswg.org/css-sizing-4/#responsive-iframes">https://drafts.csswg.org/css-sizing-4/#responsive-iframes</a> > > I see there's also an open PR to define the meta element > <a rel="nofollow" href="https://github.com/whatwg/html/pull/12444">https://github.com/whatwg/html/pull/12444</a> > > > *Summary* > Allow sites to opt into iframes having responsive sizing (sizing the > <iframe> element in the parent document to the iframe document's layout > overflow sizing, so that scrolling in the child document is avoided). > > *Blink component* > Blink>Layout > <<a rel="nofollow" href="https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ELayout%22">https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ELayout%22</a>> > > *Web Feature ID* > Missing feature > > *Motivation* > This is a natural feature to have for iframes, when the site wants to > render the iframe content so that it looks seamless with the parent frame > and avoids scrollbars. > > *Initial public proposal* > <a rel="nofollow" href="https://github.com/whatwg/html/issues/555">https://github.com/whatwg/html/issues/555</a> > > *TAG review* > <a rel="nofollow" href="https://github.com/w3ctag/design-reviews/issues/1223">https://github.com/w3ctag/design-reviews/issues/1223</a> > > *TAG review status* > Pending > > *Goals for experimentation* > None > > *Risks* > > > *Interoperability and Compatibility* > *No information provided* > > *Gecko*: No signal ( > <a rel="nofollow" href="https://github.com/mozilla/standards-positions/issues/1394">https://github.com/mozilla/standards-positions/issues/1394</a>) > > *WebKit*: No signal ( > <a rel="nofollow" href="https://github.com/WebKit/standards-positions/issues/653">https://github.com/WebKit/standards-positions/issues/653</a>) > > *Web developers*: No signals Plenty of developer demand is expressed in > the feature request standards issues: > <a rel="nofollow" href="https://github.com/whatwg/html/issues/555">https://github.com/whatwg/html/issues/555</a> > <a rel="nofollow" href="https://github.com/w3c/csswg-drafts/issues/1771">https://github.com/w3c/csswg-drafts/issues/1771</a> > <a rel="nofollow" href="https://github.com/w3c/csswg-drafts/blob/main/css-sizing-4/responsive-iframes-explainer.md#use-cases">https://github.com/w3c/csswg-drafts/blob/main/css-sizing-4/responsive-iframes-explainer.md#use-cases</a> > > *Other signals*: > > *WebView application risks* > > Does this intent deprecate or change behavior of existing APIs, such that > it has potentially high risk for Android WebView-based applications? > *No information provided* > > > *Debuggability* > *No information provided* > > *Will this feature be supported on all six Blink platforms (Windows, Mac, > Linux, ChromeOS, Android, and Android WebView)?* > Yes > > *Is this feature fully tested by web-platform-tests > <<a rel="nofollow" href="https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md">https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md</a>>?* > Yes > > <a rel="nofollow" href="https://wpt.fyi/results/css/css-sizing/responsive-iframe?label=experimental&label=master&aligned">https://wpt.fyi/results/css/css-sizing/responsive-iframe?label=experimental&label=master&aligned</a> > > *Flag name on about://flags* > responsive-iframes > > *Finch feature name* > ResponsiveIframes > > *Rollout plan* > Will ship enabled for all users > > *Requires code in //chrome?* > False > > *Tracking bug* > <a rel="nofollow" href="https://issues.chromium.org/issues/418397278">https://issues.chromium.org/issues/418397278</a> > > *Estimated milestones* > Shipping on desktop 150 > Shipping on Android 150 > Shipping on WebView 150 > > *Anticipated spec changes* > > Open questions about a feature may be a source of future web compat or > interop issues. Please list open issues (e.g. links to known github issues > in the project for the feature specification) whose resolution may > introduce web compat/interop risk (e.g., changing to naming or structure of > the API in a non-backward-compatible way). > <a rel="nofollow" href="https://github.com/w3c/csswg-drafts/issues/13589">https://github.com/w3c/csswg-drafts/issues/13589</a> - cross-origin case left > a possibility of change: "RESOLVED: Check with security folks whether > cross-origin case leaking info is an issue that needs mitigation" > > *Link to entry on the Chrome Platform Status* > <a rel="nofollow" href="https://chromestatus.com/feature/5108373464547328?gate=5102892096421888">https://chromestatus.com/feature/5108373464547328?gate=5102892096421888</a> > > *Links to previous Intent discussions* > Intent to Prototype: > <a rel="nofollow" href="https://groups.google.com/a/chromium.org/d/msgid/blink-dev/682bb3fa.2b0a0220.146035.00b7.GAE%40google.com">https://groups.google.com/a/chromium.org/d/msgid/blink-dev/682bb3fa.2b0a0220.146035.00b7.GAE%40google.com</a> > > > This intent message was generated by Chrome Platform Status > <<a rel="nofollow" href="https://chromestatus.com/">https://chromestatus.com/</a>>. > > -- > You received this message because you are subscribed to the Google Groups > "blink-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to blink-dev+unsubscr...@chromium.org. > To view this discussion visit > <a rel="nofollow" href="https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAHe_1dKm%3DLFTKhRKHV9m4fJsqYnw6M0YwGP63DNg%3DkUcv%2BAeQQ%40mail.gmail.com">https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAHe_1dKm%3DLFTKhRKHV9m4fJsqYnw6M0YwGP63DNg%3DkUcv%2BAeQQ%40mail.gmail.com</a> > > <<a rel="nofollow" href="https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAHe_1dKm%3DLFTKhRKHV9m4fJsqYnw6M0YwGP63DNg%3DkUcv%2BAeQQ%40mail.gmail.com?utm_medium=email&utm_source=footer">https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAHe_1dKm%3DLFTKhRKHV9m4fJsqYnw6M0YwGP63DNg%3DkUcv%2BAeQQ%40mail.gmail.com?utm_medium=email&utm_source=footer</a>> > . > > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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To view this discussion visit <a rel="nofollow" href="https://groups.google.com/a/chromium.org/d/msgid/blink-dev/aa96be3c-2a10-47e5-b4f4-2416625bbf3an%40chromium.org">https://groups.google.com/a/chromium.org/d/msgid/blink-dev/aa96be3c-2a10-47e5-b4f4-2416625bbf3an%40chromium.org</a>. </pre> </div> <div class="msgButtons margintopdouble"> <ul class="overflow"> <li class="msgButtonItems"><a class="button buttonleft " accesskey="p" href="msg16543.html">Previous message</a></li> <li class="msgButtonItems textaligncenter"><a class="button" accesskey="c" href="index.html#16547">View by thread</a></li> <li class="msgButtonItems textaligncenter"><a class="button" accesskey="i" href="maillist.html#16547">View by date</a></li> <li class="msgButtonItems textalignright"><a class="button buttonright " accesskey="n" href="msg16566.html">Next message</a></li> </ul> </div> <a name="tslice"></a> <div class="tSliceList margintopdouble"> <ul class="icons monospace"> <li class="icons-email"><span class="subject"><a href="msg16532.html">[blink-dev] Intent to Ship: Responsively-sized <iframe&g...</a></span> <span class="sender italic">Koji Ishii</span></li> <li><ul> <li class="icons-email"><span class="subject"><a href="msg16543.html">Re: [blink-dev] Intent to Ship: Responsively-sized <...</a></span> <span class="sender italic">Mike Taylor</span></li> <li><ul> <li class="icons-email tSliceCur"><span class="subject">Re: [blink-dev] Intent to Ship: Responsively-sized...</span> <span class="sender italic">Alex Russell</span></li> <li><ul> <li class="icons-email"><span class="subject"><a href="msg16566.html">Re: [blink-dev] Intent to Ship: Responsively-s...</a></span> <span class="sender italic">Vladimir Levin</span></li> <li><ul> <li class="icons-email"><span class="subject"><a href="msg16582.html">Re: [blink-dev] Intent to Ship: Responsive...</a></span> <span class="sender italic">Koji Ishii</span></li> <li><ul> <li class="icons-email"><span class="subject"><a href="msg16585.html">Re: [blink-dev] Intent to Ship: Respo...</a></span> <span class="sender italic">一丝</span></li> </ul> </ul> </ul> </ul> </ul> </ul> </div> <div class="overflow msgActions margintopdouble"> <div class="msgReply" > <h2> Reply via email to </h2> <form method="POST" action="/mailto.php"> <input type="hidden" name="subject" value="Re: [blink-dev] Intent to Ship: Responsively-sized <iframe>"> <input type="hidden" name="msgid" value="aa96be3c-2a10-47e5-b4f4-2416625bbf3an@chromium.org"> <input type="hidden" name="relpath" value="blink-dev@chromium.org/msg16547.html"> <input type="submit" value=" Alex Russell "> </form> </div> </div> </div> <div class="aside" role="complementary"> <div class="logo"> <a href="/"><img src="/logo.png" width=247 height=88 alt="The Mail Archive"></a> </div> <form class="overflow" action="/search" method="get"> <input type="hidden" name="l" value="blink-dev@chromium.org"> <label class="hidden" for="q">Search the site</label> <input class="submittext" type="text" id="q" name="q" placeholder="Search blink-dev"> <input class="submitbutton" name="submit" type="image" src="/submit.png" alt="Submit"> </form> <div class="nav margintop" id="nav" role="navigation"> <ul class="icons font16"> <li class="icons-home"><a href="/">The Mail Archive home</a></li> <li class="icons-list"><a href="/blink-dev@chromium.org/">blink-dev - all messages</a></li> <li class="icons-about"><a href="/blink-dev@chromium.org/info.html">blink-dev - about the list</a></li> <li class="icons-expand"><a href="/search?l=blink-dev@chromium.org&q=subject:%22Re%5C%3A+%5C%5Bblink%5C-dev%5C%5D+Intent+to+Ship%5C%3A+Responsively%5C-sized+%3Ciframe%3E%22&o=newest&f=1" title="e" id="e">Expand</a></li> <li class="icons-prev"><a href="msg16543.html" title="p">Previous message</a></li> <li class="icons-next"><a href="msg16566.html" title="n">Next message</a></li> </ul> </div> <div class="listlogo margintopdouble"> </div> <div class="margintopdouble"> </div> </div> </div> <div class="footer" role="contentinfo"> <ul> <li><a href="/">The Mail Archive home</a></li> <li><a href="/faq.html#newlist">Add your mailing list</a></li> <li><a href="/faq.html">FAQ</a></li> <li><a href="/faq.html#support">Support</a></li> <li><a href="/faq.html#privacy">Privacy</a></li> <li class="darkgray">aa96be3c-2a10-47e5-b4f4-2416625bbf3an@chromium.org</li> </ul> </div> </body> </html>