August 2020 - webkit-dev - lists.webkit.org

Moving things around a bit in libsoup code
by Alex Christensen 12 Aug '20

12 Aug '20

I’m preparing a fairly substantial change to the ownership of some important objects in WebKit in https://bugs.webkit.org/show_bug.cgi?id=203547 <https://bugs.webkit.org/show_bug.cgi?id=203547> and it has required some moving of settings from WebProcessPool to WebsiteDataStoreConfiguration. I’ve done most of those, but WebProcessPool::platformInitializeNetworkProcess in WebProcessPoolSoup.cpp requires some members be moved to a different object. Could someone who works on GTK/WPE do that in a separate patch and I’ll rebase? I’m planning to land my big patch in the next week or two, so I thought I’d give you a heads up rather than just breaking libsoup networking. Thanks, and happy coding! Alex

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EWS now parses error logs in case of build failure
by Aakash Jain 11 Aug '20

11 Aug '20

Hi Everyone, I am happy to announce another EWS feature. From now on, in case of build failure, EWS will parse the errors and display them in a separate 'errors' log. You wouldn't have to search through thousands of lines of logs to find the error message. For example, in https://ews-build.webkit.org/#/builders/16/builds/6054, in step #7 WebKit failed to compile. Complete logs (stdio) are 38,000+ lines, and the error is not at the end of the logs. Normally, it requires some searching through the logs to find the relevant errors. But now, there is another 'errors' log, which contains just the relevant 11 lines (containing error and few related lines to provide additional context). Hopefully this would save some time and efforts previously spent on searching through the large logs. Note that this information is not displayed in status-bubble tool-tip, since this might be lot of text to display in the tooltip. My further plan is to make this information more readily available, by adding it to a custom designed page which will open on clicking the status bubble https://webkit.org/b/197522 Please let me know if you notice any issues or have any feedback. Thanks Aakash Reference: https://webkit.org/b/203418

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Request for Webkit position for Imperative Shadow DOM Distribution API
by Yu Han 06 Aug '20

06 Aug '20

Hi Webkit-Dev, We would like to get an official position from webkit for Imperative Shadow DOM Distribution API. This proposal was discussed in the last TPAC F2F <https://github.com/whatwg/html/issues/3534#issuecomment-537802687>. And Chrome has implemented this API based on the F2F summary. - Specification Title: Imperative Shadow DOM Distribution API - Explainer <https://github.com/w3c/webcomponents/blob/gh-pages/proposals/Imperative-Sha…> - Spec PRs for HTML <https://github.com/whatwg/html/pull/5483> and DOM <https://github.com/whatwg/dom/pull/860> - WhatWG DOM issue discussion <https://github.com/whatwg/html/issues/3534>. - TAG Review <https://github.com/w3ctag/design-reviews/issues/486>. - ChromeStatus <https://chromestatus.com/feature/5711021289242624> - Caniuse.com URL (optional): - Bugzilla URL (optional): - Mozillians who can provide input (optional): Other information The imperative Shadow DOM distribution API allows developers to explicitly set the assigned nodes for a slot element. With this API, web developers can create web components without needing to add a specific markup, slot="" attribute, to children of the host component. In addition, it enables conditional slotting based on either environmental state or an attribute passed in. More details, including more motivating uses cases, can be found in the explainer <https://github.com/w3c/webcomponents/blob/gh-pages/proposals/Imperative-Sha…> . Example syntax: <custom-tab show-tab="2"> <tab-panel></tab-panel> <tab-panel></tab-panel> <tab-panel></tab-panel></custom-tab> class CustomTab extends HTMLElement { static get observedAttributes() { return ['show-tab']; } constructor() { super(); const shadowRoot = this.attachShadow({mode: 'open', slotAssignment: 'manual'}); shadowRoot.innerHTML = ` <div class="custom-tab"> <slot></slot> </div>`; } attributeChangedCallback(name, oldValue, newValue) { UpdateDisplayTab(this, newValue); } connectedCallback() { if (!this._observed) { const target = this; const showTab = this.getAttribute('show-tab'); const observer = new MutationObserver(function(mutations) { UpdateDisplayTab(target, showTab); }); observer.observe(this, {childList: true}); this._observed = true; } }} function UpdateDisplayTab(elem, tabIdx) { const shadow = elem.shadowRoot; const slot = shadow.querySelector("slot"); const panels = elem.querySelectorAll('tab-panel'); if (panels.length && tabIdx && tabIdx <= panels.length ) { slot.assign([panels[tabIdx-1]]); } else { slot.assign([]); }} thanks, Han

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Big Sur EWS and Apple Silicon
by Jonathan Bedard 04 Aug '20

04 Aug '20

Hello all, Recently, Aakash Jain and I have brought up Big Sur Trunk and EWS builders. These machines are building with the Big Sur Seed 3 SDK on machine running Big Sur Seed 3. Usually WebKit does not support developer seeds in automation, but universal binaries for Apple Silicon are sufficiently different from existing configurations that we wanted to provide this build configuration to WebKit developers through EWS. The ‘mac-AS’ (standing for Mac, Apple Silicon) is the bubble corresponding to this new configuration. Thank you all for your contributions, Jonathan Bedard

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Request for position on MediaRecorder constant bitrate audio encoding
by Simon Jackson 04 Aug '20

04 Aug '20

Hello WebKit-dev, I'd like to ask for Webkit's official position on a change to the editors draft of the mediacapture-record specification to make it possible to request either constant or variable bitrate audio encoding from the MediaRecorder. - Specification: https://w3c.github.io/mediacapture-record/#mediarecorder-api - Pull request & discussion of additions: w3c/mediacapture-record#185 <https://github.com/w3c/mediacapture-record/pull/185> - Explainer: https://docs.google.com/document/d/10OheBob6lP7v-fO89g0A5F9BYnsMEU5Nkh4p-Bk… - Chromestatus entry: https://chromestatus.com/feature/5730124735447040 A new enumeration (BitrateMode) has been added for specifying either constant or variable bitrate for audio encoding, MediaRecorderOptions has an extra field called audioBitrateMode for requesting a specific bitrate mode from the MediaRecorder and a field was added to MediaRecorder for retrieving the bitrate mode being used for encoding. Thanks, Simon

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