diff --git a/extensions/amp-bind/0.1/bind-impl.js b/extensions/amp-bind/0.1/bind-impl.js
index 9ce5ce0b7ef6..d720b4789136 100644
--- a/extensions/amp-bind/0.1/bind-impl.js
+++ b/extensions/amp-bind/0.1/bind-impl.js
@@ -3,7 +3,6 @@ import {AmpEvents_Enum} from '#core/constants/amp-events';
 import {Deferred} from '#core/data-structures/promise';
 import {Signals} from '#core/data-structures/signals';
 import {isAmp4Email} from '#core/document/format';
-import {iterateCursor} from '#core/dom';
 import {whenUpgradedToCustomElement} from '#core/dom/amp-element-helpers';
 import {escapeCssSelectorIdent} from '#core/dom/css-selectors';
 import {closestAncestorElementBySelector} from '#core/dom/query';
@@ -705,7 +704,7 @@ export class Bind {
     // created elements. Should do what <amp-state> does.
     const elements = this.ampdoc.getBody().querySelectorAll('AMP-BIND-MACRO');
     const macros = /** @type {!Array<!BindMacroDef>} */ ([]);
-    iterateCursor(elements, (element) => {
+    elements.forEach((element) => {
       const argumentNames = (element.getAttribute('arguments') || '')
         .split(',')
         .map((s) => s.trim());
diff --git a/extensions/amp-date-picker/0.1/amp-date-picker.js b/extensions/amp-date-picker/0.1/amp-date-picker.js
index 00eec5a9b8e4..d4c56247daa9 100644
--- a/extensions/amp-date-picker/0.1/amp-date-picker.js
+++ b/extensions/amp-date-picker/0.1/amp-date-picker.js
@@ -3,7 +3,7 @@ import {AmpEvents_Enum} from '#core/constants/amp-events';
 import {Keys_Enum} from '#core/constants/key-codes';
 import {FiniteStateMachine} from '#core/data-structures/finite-state-machine';
 import {Deferred} from '#core/data-structures/promise';
-import {isRTL, iterateCursor, tryFocus} from '#core/dom';
+import {isRTL, tryFocus} from '#core/dom';
 import {escapeCssSelectorIdent} from '#core/dom/css-selectors';
 import {Layout_Enum, isLayoutSizeDefined} from '#core/dom/layout';
 import {
@@ -1310,7 +1310,7 @@ export class AmpDatePicker extends AMP.BaseElement {
    */
   parseElementTemplates_(templates) {
     const parsed = [];
-    iterateCursor(templates, (template) =>
+    templates.forEach((template) =>
       parsed.push(this.parseElementTemplate_(template))
     );
     return parsed;
diff --git a/extensions/amp-form/0.1/amp-form-textarea.js b/extensions/amp-form/0.1/amp-form-textarea.js
index 1c91851583df..aae0fe567250 100644
--- a/extensions/amp-form/0.1/amp-form-textarea.js
+++ b/extensions/amp-form/0.1/amp-form-textarea.js
@@ -1,5 +1,5 @@
 import {AmpEvents_Enum} from '#core/constants/amp-events';
-import {iterateCursor, removeElement} from '#core/dom';
+import {removeElement} from '#core/dom';
 import {computedStyle, px, setStyle} from '#core/dom/style';
 import {toArray} from '#core/types/array';
 import {throttle} from '#core/types/function';
@@ -170,10 +170,10 @@ export function getHasOverflow(element) {
 
 /**
  * Attempt to resize all textarea elements
- * @param {!IArrayLike<!Element>} elements
+ * @param {!NodeList} elements
  */
 function resizeTextareaElements(elements) {
-  iterateCursor(elements, (element) => {
+  elements.forEach((element) => {
     if (
       element.tagName != 'TEXTAREA' ||
       !element.hasAttribute(AMP_FORM_TEXTAREA_EXPAND_ATTR)
diff --git a/extensions/amp-form/0.1/amp-form.js b/extensions/amp-form/0.1/amp-form.js
index 2f538e626c42..84eaa43ba543 100644
--- a/extensions/amp-form/0.1/amp-form.js
+++ b/extensions/amp-form/0.1/amp-form.js
@@ -523,7 +523,7 @@ export class AmpForm {
     const validityElements = this.form_.querySelectorAll(
       '.user-valid, .user-invalid'
     );
-    iterateCursor(validityElements, (element) => {
+    validityElements.forEach((element) => {
       element.classList.remove('user-valid');
       element.classList.remove('user-invalid');
     });
@@ -531,7 +531,7 @@ export class AmpForm {
     const messageElements = this.form_.querySelectorAll(
       '.visible[validation-for]'
     );
-    iterateCursor(messageElements, (element) => {
+    messageElements.forEach((element) => {
       element.classList.remove('visible');
     });
 
@@ -1401,7 +1401,7 @@ export class AmpForm {
         maybeFillField(field, key);
       } else if (formControls.length) {
         const fields = /** @type {!NodeList} */ (formControls);
-        iterateCursor(fields, (field) => maybeFillField(field, key));
+        fields.forEach((field) => maybeFillField(field, key));
       }
     });
   }
@@ -1434,7 +1434,7 @@ export class AmpForm {
  */
 function checkUserValidityOnSubmission(form) {
   const elements = form.querySelectorAll('input,select,textarea,fieldset');
-  iterateCursor(elements, (element) => checkUserValidity(element));
+  elements.forEach((element) => checkUserValidity(element));
   return checkUserValidity(form);
 }
 
@@ -1477,7 +1477,7 @@ function removeValidityStateClasses(form) {
     const elements = form.querySelectorAll(
       `.${escapeCssSelectorIdent(validityState)}`
     );
-    iterateCursor(elements, (element) => {
+    elements.forEach((element) => {
       dev().assertElement(element).classList.remove(validityState);
     });
   }
@@ -1620,8 +1620,7 @@ export class AmpFormService {
 
   /**
    * Install submission handler on all forms in the document.
-   * @param {?IArrayLike<T>} forms
-   * @template T
+   * @param {NodeList} forms
    * @private
    */
   installSubmissionHandlers_(forms) {
@@ -1629,7 +1628,7 @@ export class AmpFormService {
       return;
     }
 
-    iterateCursor(forms, (form, index) => {
+    forms.forEach((form, index) => {
       const existingAmpForm = formOrNullForElement(form);
       if (!existingAmpForm) {
         new AmpForm(form, `amp-form-${index}`);
diff --git a/extensions/amp-fx-collection/0.1/amp-fx-collection.js b/extensions/amp-fx-collection/0.1/amp-fx-collection.js
index 0ea2fde2037c..728f22b01607 100644
--- a/extensions/amp-fx-collection/0.1/amp-fx-collection.js
+++ b/extensions/amp-fx-collection/0.1/amp-fx-collection.js
@@ -1,5 +1,4 @@
 import {AmpEvents_Enum} from '#core/constants/amp-events';
-import {iterateCursor} from '#core/dom';
 import {tryCallback} from '#core/error';
 
 import {listen} from '#utils/event-helper';
@@ -49,7 +48,7 @@ export class AmpFxCollection {
    */
   scan_() {
     const elements = this.ampdoc_.getRootNode().querySelectorAll('[amp-fx]');
-    iterateCursor(elements, (element) => {
+    elements.forEach((element) => {
       if (this.seen_.includes(element)) {
         return;
       }
diff --git a/extensions/amp-inline-gallery/0.1/amp-inline-gallery-slide.js b/extensions/amp-inline-gallery/0.1/amp-inline-gallery-slide.js
index dfa03dd31aa5..22d9352d1f03 100644
--- a/extensions/amp-inline-gallery/0.1/amp-inline-gallery-slide.js
+++ b/extensions/amp-inline-gallery/0.1/amp-inline-gallery-slide.js
@@ -1,6 +1,5 @@
 import {Layout_Enum} from '#core/dom/layout';
 import {htmlFor} from '#core/dom/static-template';
-import {toArray} from '#core/types/array';
 
 import {isExperimentOn} from '#experiments';
 
@@ -85,23 +84,17 @@ export class AmpInlineGallerySlide extends AMP.BaseElement {
     const attributionSlot = dom.querySelector(
       '.i-amphtml-inline-gallery-slide-persistent-slot'
     );
-    const childNodesArray = toArray(this.element.childNodes);
 
-    childNodesArray
-      .filter((n) => {
-        return n.hasAttribute && n.getAttribute('slot') === 'caption';
-      })
-      .forEach((node) => captionSlot.appendChild(node));
-    childNodesArray
-      .filter((n) => {
-        return !n.hasAttribute || !n.hasAttribute('slot');
-      })
-      .forEach((node) => contentSlot.appendChild(node));
-    childNodesArray
-      .filter((n) => {
-        return n.hasAttribute && n.getAttribute('slot') === 'attribution';
-      })
-      .forEach((node) => attributionSlot.appendChild(node));
+    this.element.childNodes.forEach((node) => {
+      const slot = node.getAttribute?.('slot');
+      if (slot === 'caption') {
+        captionSlot.appendChild(node);
+      } else if (slot === 'attribution') {
+        attributionSlot.appendChild(node);
+      } else if (slot == null) {
+        contentSlot.appendChild(node);
+      }
+    });
 
     this.element.appendChild(dom);
   }
diff --git a/extensions/amp-inline-gallery/0.1/amp-inline-gallery.js b/extensions/amp-inline-gallery/0.1/amp-inline-gallery.js
index 2228f3edd455..29e2d761d343 100644
--- a/extensions/amp-inline-gallery/0.1/amp-inline-gallery.js
+++ b/extensions/amp-inline-gallery/0.1/amp-inline-gallery.js
@@ -1,4 +1,3 @@
-import {iterateCursor} from '#core/dom';
 import {Layout_Enum} from '#core/dom/layout';
 import {scopedQuerySelector, scopedQuerySelectorAll} from '#core/dom/query';
 import {toArray} from '#core/types/array';
@@ -92,14 +91,14 @@ class AmpInlineGallery extends AMP.BaseElement {
    * @private
    */
   updateProgress_(total, index, offset, slides) {
-    iterateCursor(
-      scopedQuerySelectorAll(this.element, CHILDREN_FOR_PROGRESS_SELECTOR),
-      (el) => {
-        el.getImpl().then((pagination) => {
-          pagination.updateProgress(total, index, offset, slides);
-        });
-      }
-    );
+    scopedQuerySelectorAll(
+      this.element,
+      CHILDREN_FOR_PROGRESS_SELECTOR
+    ).forEach((el) => {
+      el.getImpl().then((pagination) => {
+        pagination.updateProgress(total, index, offset, slides);
+      });
+    });
   }
 
   /**
@@ -137,14 +136,11 @@ class AmpInlineGallery extends AMP.BaseElement {
     const detail = getDetail(event);
     const index = detail['index'];
 
-    iterateCursor(
-      scopedQuerySelectorAll(this.element, CAROUSEL_SELECTOR),
-      (el) => {
-        el.getImpl().then((carousel) => {
-          carousel.goToSlide(index, {smoothScroll: true});
-        });
-      }
-    );
+    scopedQuerySelectorAll(this.element, CAROUSEL_SELECTOR).forEach((el) => {
+      el.getImpl().then((carousel) => {
+        carousel.goToSlide(index, {smoothScroll: true});
+      });
+    });
   }
 }
 
diff --git a/extensions/amp-inputmask/0.1/amp-inputmask.js b/extensions/amp-inputmask/0.1/amp-inputmask.js
index 2e7551be81bb..ce606dcd8377 100644
--- a/extensions/amp-inputmask/0.1/amp-inputmask.js
+++ b/extensions/amp-inputmask/0.1/amp-inputmask.js
@@ -1,5 +1,4 @@
 import {AmpEvents_Enum} from '#core/constants/amp-events';
-import {iterateCursor} from '#core/dom';
 
 import {listen} from '#utils/event-helper';
 
@@ -33,7 +32,7 @@ export class AmpInputmaskService {
     const maskElements = this.ampdoc
       .getRootNode()
       .querySelectorAll('input[mask]');
-    iterateCursor(maskElements, (element) => {
+    maskElements.forEach((element) => {
       if (TextMask.isMasked(element)) {
         return;
       }
diff --git a/extensions/amp-lightbox-gallery/0.1/service/lightbox-manager-impl.js b/extensions/amp-lightbox-gallery/0.1/service/lightbox-manager-impl.js
index 00a0c238f141..87e6bfda2920 100644
--- a/extensions/amp-lightbox-gallery/0.1/service/lightbox-manager-impl.js
+++ b/extensions/amp-lightbox-gallery/0.1/service/lightbox-manager-impl.js
@@ -1,6 +1,5 @@
 import {AmpEvents_Enum} from '#core/constants/amp-events';
 import {CommonSignals_Enum} from '#core/constants/common-signals';
-import {iterateCursor} from '#core/dom';
 import {
   childElement,
   childElementByAttr,
@@ -153,7 +152,7 @@ export class LightboxManager {
         .getRootNode()
         .querySelectorAll('[lightbox],[data-lightbox]');
       const processLightboxElement = this.processLightboxElement_.bind(this);
-      iterateCursor(matches, processLightboxElement);
+      matches.forEach(processLightboxElement);
     });
   }
 
diff --git a/extensions/amp-link-rewriter/0.1/scope.js b/extensions/amp-link-rewriter/0.1/scope.js
index b28959cb9bc8..2ca4e42bb524 100644
--- a/extensions/amp-link-rewriter/0.1/scope.js
+++ b/extensions/amp-link-rewriter/0.1/scope.js
@@ -1,4 +1,3 @@
-import {iterateCursor} from '#core/dom';
 import {closestAncestorElementBySelector} from '#core/dom/query';
 
 /**
@@ -18,7 +17,7 @@ export function getScopeElements(ampDoc, configOpts) {
     selection = doc.querySelectorAll(cssSelector);
   }
 
-  iterateCursor(selection, (element) => {
+  selection.forEach((element) => {
     if (hasAttributeValues(element, configOpts)) {
       filteredSelection.push(element);
     }
diff --git a/extensions/amp-mustache/0.1/amp-mustache.js b/extensions/amp-mustache/0.1/amp-mustache.js
index c5d58d8be3d4..47e9ac2201ab 100644
--- a/extensions/amp-mustache/0.1/amp-mustache.js
+++ b/extensions/amp-mustache/0.1/amp-mustache.js
@@ -1,4 +1,4 @@
-import {iterateCursor, templateContentClone} from '#core/dom';
+import {templateContentClone} from '#core/dom';
 
 import {user} from '#utils/log';
 
@@ -85,7 +85,7 @@ export class AmpMustache extends BaseTemplate {
    */
   processNestedTemplates_(content) {
     const templates = content.querySelectorAll('template');
-    iterateCursor(templates, (nestedTemplate, index) => {
+    templates.forEach((nestedTemplate, index) => {
       const nestedTemplateKey = `__AMP_NESTED_TEMPLATE_${index}`;
       this.nestedTemplates_[nestedTemplateKey] =
         nestedTemplate./*OK*/ outerHTML;
diff --git a/extensions/amp-mustache/0.2/amp-mustache.js b/extensions/amp-mustache/0.2/amp-mustache.js
index e980e07af72a..0c2b59bb7084 100644
--- a/extensions/amp-mustache/0.2/amp-mustache.js
+++ b/extensions/amp-mustache/0.2/amp-mustache.js
@@ -1,4 +1,4 @@
-import {iterateCursor, templateContentClone} from '#core/dom';
+import {templateContentClone} from '#core/dom';
 
 import {Purifier} from '#purifier';
 
@@ -88,7 +88,7 @@ export class AmpMustache extends BaseTemplate {
    */
   processNestedTemplates_(content) {
     const templates = content.querySelectorAll('template');
-    iterateCursor(templates, (template, index) => {
+    templates.forEach((template, index) => {
       const key = `__AMP_NESTED_TEMPLATE_${index}`;
 
       // Store the nested template markup, keyed by index.
diff --git a/extensions/amp-story-auto-ads/0.1/story-ad-ui.js b/extensions/amp-story-auto-ads/0.1/story-ad-ui.js
index fb316620f537..dccd2f8fde6e 100644
--- a/extensions/amp-story-auto-ads/0.1/story-ad-ui.js
+++ b/extensions/amp-story-auto-ads/0.1/story-ad-ui.js
@@ -1,4 +1,4 @@
-import {createElementWithAttributes, iterateCursor} from '#core/dom';
+import {createElementWithAttributes} from '#core/dom';
 import {map} from '#core/types/object';
 import {getWin} from '#core/window';
 
@@ -77,7 +77,7 @@ export function getStoryAdMetaTags(doc) {
  */
 export function getStoryAdMetadataFromDoc(metaTags) {
   const vars = map();
-  iterateCursor(metaTags, (tag) => {
+  metaTags.forEach((tag) => {
     const {content, name} = tag;
     if (name.startsWith(CTA_META_PREFIX)) {
       const key = name.split('amp-')[1];
@@ -98,7 +98,7 @@ export function getStoryAdMetadataFromDoc(metaTags) {
  */
 export function getStoryAdMacroTags(metaTags) {
   const result = map();
-  iterateCursor(metaTags, (tag) => {
+  metaTags.forEach((tag) => {
     const {content, name} = tag;
     // If the meta tag name is not alphanumerical, we would ignore it.
     if (/^[a-zA-Z0-9\-_]+$/.test(name)) {
diff --git a/extensions/amp-story/1.0/amp-story-grid-layer.js b/extensions/amp-story/1.0/amp-story-grid-layer.js
index 5606ddd15653..1ab88483d446 100644
--- a/extensions/amp-story/1.0/amp-story-grid-layer.js
+++ b/extensions/amp-story/1.0/amp-story-grid-layer.js
@@ -103,7 +103,7 @@ export class AmpStoryGridLayer extends AmpStoryBaseLayer {
       SUPPORTED_CSS_GRID_ATTRIBUTES_SELECTOR
     );
 
-    Array.prototype.forEach.call(elementsToUpgradeStyles, (element) => {
+    elementsToUpgradeStyles.forEach((element) => {
       this.setCssGridStyles_(element);
     });
   }
diff --git a/extensions/amp-story/1.0/amp-story-page.js b/extensions/amp-story/1.0/amp-story-page.js
index e555b175ad3a..48a5ba39b194 100644
--- a/extensions/amp-story/1.0/amp-story-page.js
+++ b/extensions/amp-story/1.0/amp-story-page.js
@@ -10,7 +10,6 @@
  */
 import {CommonSignals_Enum} from '#core/constants/common-signals';
 import {Deferred} from '#core/data-structures/promise';
-import {iterateCursor} from '#core/dom';
 import {whenUpgradedToCustomElement} from '#core/dom/amp-element-helpers';
 import * as Preact from '#core/dom/jsx';
 import {Layout_Enum} from '#core/dom/layout';
@@ -389,7 +388,7 @@ export class AmpStoryPage extends AMP.BaseElement {
    * play videos from an inactive page.
    */
   delegateVideoAutoplay() {
-    iterateCursor(this.element.querySelectorAll('amp-video'), delegateAutoplay);
+    this.element.querySelectorAll('amp-video').forEach(delegateAutoplay);
   }
 
   /** @private */
@@ -413,7 +412,7 @@ export class AmpStoryPage extends AMP.BaseElement {
    */
   markMediaElementsWithPreload_() {
     const mediaSet = this.element.querySelectorAll('amp-audio, amp-video');
-    Array.prototype.forEach.call(mediaSet, (mediaItem) => {
+    mediaSet.forEach((mediaItem) => {
       mediaItem.setAttribute('preload', 'auto');
     });
   }
@@ -738,18 +737,15 @@ export class AmpStoryPage extends AMP.BaseElement {
       );
     const mediaSet = [];
 
-    iterateCursor(scopedQuerySelectorAll(this.element, selector), (el) =>
+    scopedQuerySelectorAll(this.element, selector).forEach((el) =>
       mediaSet.push(el)
     );
 
     if (fie) {
-      iterateCursor(
-        scopedQuerySelectorAll(
-          fie.win.document.body,
-          selector.replace(/amp-story-grid-layer/g, '')
-        ),
-        (el) => mediaSet.push(el)
-      );
+      scopedQuerySelectorAll(
+        fie.win.document.body,
+        selector.replace(/amp-story-grid-layer/g, '')
+      ).forEach((el) => mediaSet.push(el));
     }
 
     return mediaSet;
@@ -1420,7 +1416,7 @@ export class AmpStoryPage extends AMP.BaseElement {
       }
     }
 
-    Array.prototype.forEach.call(videoEls, (videoEl) => {
+    videoEls.forEach((videoEl) => {
       this.unlisteners_.push(
         listen(videoEl, 'playing', () =>
           this.debounceToggleLoadingSpinner_(false)
diff --git a/extensions/amp-story/1.0/amp-story.js b/extensions/amp-story/1.0/amp-story.js
index 0a23929633fc..6a2088aa7bc5 100644
--- a/extensions/amp-story/1.0/amp-story.js
+++ b/extensions/amp-story/1.0/amp-story.js
@@ -2439,7 +2439,7 @@ export class AmpStory extends AMP.BaseElement {
         'amp-story-cta-layer a'
       );
 
-      Array.prototype.forEach.call(ctaAnchorEls, (ctaAnchorEl) => {
+      ctaAnchorEls.forEach((ctaAnchorEl) => {
         ctaAnchorEl.setAttribute('data-vars-story-page-id', pageId);
         ctaAnchorEl.setAttribute('data-vars-story-page-index', pageIndex);
       });
diff --git a/extensions/amp-story/1.0/sources.js b/extensions/amp-story/1.0/sources.js
index c0829065c60d..a798b5a7c92b 100644
--- a/extensions/amp-story/1.0/sources.js
+++ b/extensions/amp-story/1.0/sources.js
@@ -34,7 +34,7 @@ export class Sources {
    * @private
    */
   applyTracksToElement_(element) {
-    Array.prototype.forEach.call(this.trackEls_, (trackEl) => {
+    this.trackEls_.forEach((trackEl) => {
       const track = document.createElement('track');
       track.id = trackEl.id;
       track.kind = trackEl.kind;
@@ -65,9 +65,7 @@ export class Sources {
       element.setAttribute('src', this.srcAttr_);
     }
 
-    Array.prototype.forEach.call(this.srcEls_, (srcEl) =>
-      element.appendChild(srcEl)
-    );
+    this.srcEls_.forEach((srcEl) => element.appendChild(srcEl));
     if (element.changedSources) {
       element.changedSources();
     }
diff --git a/extensions/amp-story/1.0/utils.js b/extensions/amp-story/1.0/utils.js
index 48ef45fc7740..824e035a1f7f 100644
--- a/extensions/amp-story/1.0/utils.js
+++ b/extensions/amp-story/1.0/utils.js
@@ -299,7 +299,7 @@ export function setTextBackgroundColor(element) {
     TEXT_BACKGROUND_COLOR_SELECTOR
   );
 
-  Array.prototype.forEach.call(elementsToUpgradeStyles, (el) => {
+  elementsToUpgradeStyles.forEach((el) => {
     const color = el.getAttribute(TEXT_BACKGROUND_COLOR_ATTRIBUTE_NAME);
     setStyle(el, 'background-color', color);
   });
diff --git a/extensions/amp-subscriptions/0.1/crypto-handler.js b/extensions/amp-subscriptions/0.1/crypto-handler.js
index 13111e646987..13acdb667d84 100644
--- a/extensions/amp-subscriptions/0.1/crypto-handler.js
+++ b/extensions/amp-subscriptions/0.1/crypto-handler.js
@@ -1,4 +1,3 @@
-import {iterateCursor} from '#core/dom';
 import {toArray} from '#core/types/array';
 import {tryParseJson} from '#core/types/object/json';
 import {padStart} from '#core/types/string';
@@ -111,7 +110,7 @@ export class CryptoHandler {
           .getRootNode()
           .querySelectorAll('script[ciphertext]');
         const promises = [];
-        iterateCursor(encryptedSections, (encryptedSection) => {
+        encryptedSections.forEach((encryptedSection) => {
           const text = encryptedSection.textContent.replace(/\s+/g, '');
           const contentBuffer = base64Decode(text).buffer;
           const iv = contentBuffer.slice(0, 12);
diff --git a/extensions/amp-truncate-text/0.1/amp-truncate-text.js b/extensions/amp-truncate-text/0.1/amp-truncate-text.js
index 7d5f3d1bbd39..99f7cba85c96 100644
--- a/extensions/amp-truncate-text/0.1/amp-truncate-text.js
+++ b/extensions/amp-truncate-text/0.1/amp-truncate-text.js
@@ -1,4 +1,3 @@
-import {iterateCursor} from '#core/dom';
 import {
   closestAncestorElementBySelector,
   realChildNodes,
@@ -126,18 +125,15 @@ export class AmpTruncateText extends AMP.BaseElement {
       '.i-amphtml-truncate-persistent-slot'
     );
 
-    iterateCursor(this.element.querySelectorAll('[slot="collapsed"]'), (el) => {
+    this.element.querySelectorAll('[slot="collapsed"]').forEach((el) => {
       this.collapsedSlot_.appendChild(el);
     });
-    iterateCursor(this.element.querySelectorAll('[slot="expanded"]'), (el) => {
+    this.element.querySelectorAll('[slot="expanded"]').forEach((el) => {
       this.expandedSlot_.appendChild(el);
     });
-    iterateCursor(
-      this.element.querySelectorAll('[slot="persistent"]'),
-      (el) => {
-        this.persistentSlot_.appendChild(el);
-      }
-    );
+    this.element.querySelectorAll('[slot="persistent"]').forEach((el) => {
+      this.persistentSlot_.appendChild(el);
+    });
     realChildNodes(this.element).forEach((node) => {
       defaultSlot.appendChild(node);
     });
diff --git a/extensions/amp-video/0.1/video-cache.js b/extensions/amp-video/0.1/video-cache.js
index d66dc7b8cc51..d01202c70ef4 100644
--- a/extensions/amp-video/0.1/video-cache.js
+++ b/extensions/amp-video/0.1/video-cache.js
@@ -1,8 +1,4 @@
-import {
-  createElementWithAttributes,
-  iterateCursor,
-  removeElement,
-} from '#core/dom';
+import {createElementWithAttributes, removeElement} from '#core/dom';
 import {matches} from '#core/dom/query';
 import {toArray} from '#core/types/array';
 
@@ -210,8 +206,7 @@ function maybeReplaceSrcWithSourceElement(videoEl, win) {
 
   // Remove all existing sources as they are never supposed to play for a video
   // that has a src, cf https://html.spec.whatwg.org/#concept-media-load-algorithm
-  const sourceEls = videoEl.querySelectorAll('source');
-  iterateCursor(sourceEls, (el) => removeElement(el));
+  videoEl.querySelectorAll('source').forEach(removeElement);
 
   videoEl.insertBefore(sourceEl, videoEl.firstChild);
 }
diff --git a/src/service/ampdoc-impl.js b/src/service/ampdoc-impl.js
index 213699af6f66..e4e60c56648b 100644
--- a/src/service/ampdoc-impl.js
+++ b/src/service/ampdoc-impl.js
@@ -8,7 +8,7 @@ import {
   getDocumentVisibilityState,
   removeDocumentVisibilityChangeListener,
 } from '#core/document/visibility';
-import {iterateCursor, rootNodeFor, waitForBodyOpenPromise} from '#core/dom';
+import {rootNodeFor, waitForBodyOpenPromise} from '#core/dom';
 import {isEnumValue} from '#core/types';
 import {map} from '#core/types/object';
 import {parseQueryString} from '#core/types/string/url';
@@ -356,7 +356,7 @@ export class AmpDoc {
     const metaEls = dev()
       .assertElement(this.win.document.head)
       .querySelectorAll('meta[name]');
-    iterateCursor(metaEls, (metaEl) => {
+    metaEls.forEach((metaEl) => {
       const name = metaEl.getAttribute('name');
       const content = metaEl.getAttribute('content');
       if (!name || content === null) {
diff --git a/src/shadow-embed.js b/src/shadow-embed.js
index 77178909bb99..946eb65c8f6f 100644
--- a/src/shadow-embed.js
+++ b/src/shadow-embed.js
@@ -1,4 +1,3 @@
-import {iterateCursor} from '#core/dom';
 import {escapeCssSelectorIdent} from '#core/dom/css-selectors';
 import {setInitialDisplay, setStyle} from '#core/dom/style';
 import {
@@ -52,7 +51,7 @@ export function createShadowRoot(hostElement) {
       Object.defineProperty(shadowRoot, 'styleSheets', {
         get: function () {
           const items = [];
-          iterateCursor(shadowRoot.childNodes, (child) => {
+          shadowRoot.childNodes.forEach((child) => {
             if (child.tagName === 'STYLE') {
               items.push(child.sheet);
             }
diff --git a/src/utils/dom-writer.js b/src/utils/dom-writer.js
index 766bf05ca84b..c4d6d5b35ccb 100644
--- a/src/utils/dom-writer.js
+++ b/src/utils/dom-writer.js
@@ -1,5 +1,5 @@
 import {devAssert} from '#core/assert';
-import {iterateCursor, removeElement} from '#core/dom';
+import {removeElement} from '#core/dom';
 import {childElementsByTag} from '#core/dom/query';
 
 import {Services} from '#service';
@@ -330,8 +330,5 @@ export class DomWriterBulk {
  * @param {!Element} parent
  */
 export function removeNoScriptElements(parent) {
-  const noscriptElements = childElementsByTag(parent, 'noscript');
-  iterateCursor(noscriptElements, (element) => {
-    removeElement(element);
-  });
+  childElementsByTag(parent, 'noscript').forEach(removeElement);
 }