diff --git a/src/core/Parser.ts b/src/core/Parser.ts
index 654edf2c..67971797 100644
--- a/src/core/Parser.ts
+++ b/src/core/Parser.ts
@@ -10,11 +10,6 @@ import {
   getTagName,
 } from "../internal";
 
-export interface ParseOptions {
-  state: "html" | "cdata" | "parsed-text" | "static-text";
-  ignoreAttributes: boolean;
-}
-
 export interface Part {
   pos: number;
   endPos: number;
@@ -54,7 +49,6 @@ export class Parser {
   public activePart!: Part; // The current part at the top of the part stack
   public forward!: boolean;
   public notifiers: ReturnType<typeof createNotifiers>;
-  public userIsOpenTagOnly?: (tagName: string) => boolean;
   public currentOpenTag: STATE.OpenTagPart | undefined; // Used to reference the current open tag that is being parsed
   public currentAttribute: STATE.AttrPart | undefined; // Used to reference the current attribute that is being parsed
   public withinAttrGroup!: boolean; // Set to true if the parser is within a concise mode attribute group
@@ -68,7 +62,7 @@ export class Parser {
   public endingMixedModeAtEOL?: boolean; // Used as a flag to record that the next EOL to exit HTML mode and go back to concise
   public textPos!: number; // Used to buffer text that is found within the body of a tag
   public text!: string; // Used to buffer text that is found within the body of a tag
-  public textParseMode!: ParseOptions["state"];
+  public textParseMode!: "html" | "cdata" | "parsed-text" | "static-text";
   public blockStack!: ((
     | STATE.OpenTagPart
     | {
@@ -78,16 +72,9 @@ export class Parser {
       }
   ) & { body?: BODY_MODE; nestedIndent?: string })[]; // Used to keep track of HTML tags and HTML blocks
 
-  constructor(
-    listeners,
-    options?: {
-      concise?: boolean;
-      isOpenTagOnly?: (tagName: string) => boolean;
-    }
-  ) {
+  constructor(listeners) {
     this.reset();
     this.notifiers = createNotifiers(this, listeners);
-    this.userIsOpenTagOnly = options?.isOpenTagOnly;
   }
 
   reset() {
@@ -242,9 +229,7 @@ export class Parser {
    * are immediately closed.
    */
   isOpenTagOnly(tagName: string) {
-    if (!tagName) return false;
-    tagName = tagName.toLowerCase();
-    return this.userIsOpenTagOnly?.(tagName) ?? htmlTags.isOpenTagOnly(tagName);
+    return tagName ? htmlTags.isOpenTagOnly(tagName.toLowerCase()) : false;
   }
 
   addText(text: string) {
diff --git a/src/states/OPEN_TAG.ts b/src/states/OPEN_TAG.ts
index 380310bd..c61f68c9 100644
--- a/src/states/OPEN_TAG.ts
+++ b/src/states/OPEN_TAG.ts
@@ -1,4 +1,3 @@
-import type { ParseOptions } from "querystring";
 import {
   CODE,
   STATE,
@@ -30,7 +29,6 @@ export interface OpenTagPart extends Part {
   attributes: STATE.AttrPart[];
   indent: string;
   nestedIndent?: string;
-  parseOptions?: Partial<ParseOptions> & Record<string, unknown>;
 }
 
 export const OPEN_TAG: StateDefinition<OpenTagPart> = {
@@ -61,19 +59,8 @@ export const OPEN_TAG: StateDefinition<OpenTagPart> = {
 
   exit(tag) {
     const tagName = tag.tagName;
-    const attributes = tag.attributes;
-    const parseOptions = tag.parseOptions;
     const selfClosed = tag.selfClosed;
-
-    const ignoreAttributes =
-      parseOptions && parseOptions.ignoreAttributes === true;
-
-    if (ignoreAttributes) {
-      attributes.length = 0;
-    }
-
     const openTagOnly = (tag.openTagOnly = this.isOpenTagOnly(tagName.value));
-
     const origState = this.state;
     this.notifiers.notifyOpenTag(tag);
 
diff --git a/src/util/notify-util.ts b/src/util/notify-util.ts
index bf34f463..0dd26eda 100644
--- a/src/util/notify-util.ts
+++ b/src/util/notify-util.ts
@@ -90,11 +90,6 @@ export function createNotifiers(parser: Parser, listeners) {
           concise: tagInfo.concise,
           shorthandId: tagInfo.shorthandId,
           shorthandClassNames: tagInfo.shorthandClassNames,
-          setParseOptions(parseOptions) {
-            if (parseOptions) {
-              tagInfo.parseOptions = parseOptions;
-            }
-          },
         };
 
         eventFunc.call(parser, event, parser);
@@ -136,22 +131,6 @@ export function createNotifiers(parser: Parser, listeners) {
             method: attr.method,
             bound: attr.bound,
           })),
-          setParseOptions(parseOptions) {
-            if (!parseOptions) {
-              return;
-            }
-            const newState = parseOptions.state;
-
-            if (newState) {
-              if (newState === "parsed-text") {
-                parser.enterParsedTextContentState();
-              } else if (newState === "static-text") {
-                parser.enterStaticTextContentState();
-              }
-            }
-
-            tagInfo.parseOptions = parseOptions;
-          },
         };
 
         eventFunc.call(parser, event, parser);
diff --git a/test/autotest/commas-relax/test.js b/test/autotest/commas-relax/test.js
deleted file mode 100644
index e3b2243e..00000000
--- a/test/autotest/commas-relax/test.js
+++ /dev/null
@@ -1,7 +0,0 @@
-exports.openTagNameHandlers = {
-    import: function(event) {
-        event.setParseOptions({
-            relaxRequireCommas: true
-        });
-    }
-};
\ No newline at end of file
diff --git a/test/autotest/ignoreAttributes/expected.html b/test/autotest/ignoreAttributes/expected.html
deleted file mode 100644
index cbd94290..00000000
--- a/test/autotest/ignoreAttributes/expected.html
+++ /dev/null
@@ -1,2 +0,0 @@
-<static>
-</static>
diff --git a/test/autotest/ignoreAttributes/input.htmljs b/test/autotest/ignoreAttributes/input.htmljs
deleted file mode 100644
index 0b3a672c..00000000
--- a/test/autotest/ignoreAttributes/input.htmljs
+++ /dev/null
@@ -1 +0,0 @@
-static var startDate = new Date();
\ No newline at end of file
diff --git a/test/autotest/ignoreAttributes/test.js b/test/autotest/ignoreAttributes/test.js
deleted file mode 100644
index efe4881c..00000000
--- a/test/autotest/ignoreAttributes/test.js
+++ /dev/null
@@ -1,7 +0,0 @@
-exports.openTagNameHandlers = {
-    static: function(event) {
-        event.setParseOptions({
-            ignoreAttributes: true
-        });
-    }
-};
\ No newline at end of file
diff --git a/test/autotest/mixed-open-tag-only/expected.html b/test/autotest/mixed-open-tag-only/expected.html
index ee8c1c0e..b4e429fd 100644
--- a/test/autotest/mixed-open-tag-only/expected.html
+++ b/test/autotest/mixed-open-tag-only/expected.html
@@ -5,10 +5,5 @@
 text:"\n"
 <img src=("marko2.png") OPEN_ONLY>
 </img>
-<foo-img src=("marko3.png") OPEN_ONLY>
-</foo-img>
-<FOO-IMG src=("marko4.png") OPEN_ONLY>
-</FOO-IMG>
-text:"\n"
 <div class=("foo")>
 </div>
diff --git a/test/autotest/mixed-open-tag-only/input.htmljs b/test/autotest/mixed-open-tag-only/input.htmljs
index 81ec156f..a36a561a 100644
--- a/test/autotest/mixed-open-tag-only/input.htmljs
+++ b/test/autotest/mixed-open-tag-only/input.htmljs
@@ -1,6 +1,4 @@
 var colors=['red', 'green', 'blue']
 <img src="marko.png">
 img src="marko2.png"
-foo-img src="marko3.png"
-<FOO-IMG src="marko4.png">
 div class="foo"
\ No newline at end of file
diff --git a/test/autotest/open-tag-only-custom/expected.html b/test/autotest/open-tag-only-custom/expected.html
deleted file mode 100644
index de36e094..00000000
--- a/test/autotest/open-tag-only-custom/expected.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<div>
-    text:"\n    "
-    <bar-img src=("test.png") OPEN_ONLY>
-    </bar-img>
-    text:"\n    "
-    <link>
-        text:"Normally a link tag is open tag only"
-    </link>
-    text:"\n"
-</div>
diff --git a/test/autotest/open-tag-only-custom/input.htmljs b/test/autotest/open-tag-only-custom/input.htmljs
deleted file mode 100644
index 815ed3b5..00000000
--- a/test/autotest/open-tag-only-custom/input.htmljs
+++ /dev/null
@@ -1,4 +0,0 @@
-<div>
-    <bar-img src="test.png">
-    <link>Normally a link tag is open tag only</link>
-</div>
\ No newline at end of file
diff --git a/test/autotest/open-tag-only-custom/test.js b/test/autotest/open-tag-only-custom/test.js
deleted file mode 100644
index 3f570fe8..00000000
--- a/test/autotest/open-tag-only-custom/test.js
+++ /dev/null
@@ -1,9 +0,0 @@
-exports.isOpenTagOnly = function(tagName) {
-    if (tagName === 'bar-img') {
-        return true;
-    } else if (tagName === 'link') {
-        return false;
-    } else {
-        return undefined;
-    }
-};
\ No newline at end of file